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ZYBERNO
Stock Report
Updated Aug 28, 2026

DELTA AIR LINES, INC. (DAL)

NYSE

$81.14
Delta Air Lines Inc. is an American airline and one of the world's largest airlines by revenue, passengers carried, and fleet size, headquartered in Atlanta, Georgia. Founded in 1924 as Huff Daland Dusters crop dusting operation and reorganized as Delta Air Service in 1928, the company operates through Airline and Refinery segments, providing scheduled air transportation for passengers and cargo across the United States and internationally. Delta employs approximately 100,000 people and operates up to 5,500 daily flights on Delta and Delta Connection to more than 300 destinations across six continents through a global hub system centered on Hartsfield-Jackson Atlanta International Airport, one of the world's busiest passenger airports. As a founding member of the SkyTeam global alliance with 19 member airlines, Delta ranks first among major carriers in revenue and brand value, operating major hubs in Atlanta, Detroit, Los Angeles, Minneapolis, New York-JFK, Salt Lake City, and Seattle. Trading on the New York Stock Exchange under ticker symbol DAL, Delta provides a world-class customer experience with premium cabin products including Delta One business class, First Class, Comfort+, and Main Cabin, while also operating Delta Private Jets and connecting people and communities across its extensive domestic and international network.

Professional Investment Analysis

ZYBERNO SCORE →
Is it a great business? Is it getting better?
51.0/100
AVERAGE BUSINESS
DELTA AIR LINES, INC. (DAL) scores 51/100 — decent metrics but limited evidence of durable competitive advantage.
📊 How is the Zyberno Score calculated? +
VALUATION SIGNAL
MARGIN OF SAFETY
Is this stock cheap or expensive relative to what the business has historically generated for owners?
+66.1%
Undervalued
Is the market underestimating or overestimating what this business is capable of going forward?
+4.4%
Slight Underestimate
↑ UNDER
+50%
Brina Gap
-50%
↓ OVER
← OVERVALUED
-100%
Margin of Safety
UNDERVALUED →
+100%
UNDERESTIMATED
GROWTH
DOUBLE
DISCOUNT
EXPENSIVE
HYPE
VALUE
TRAP
0,0
MoS +66.1%  ·  Gap +4.4%

Two independent signals. One tells you if the stock is cheap relative to what the business has historically generated for owners — the Margin of Safety. The other tells you if the market is underestimating what the business is capable of going forward — the Brina Gap.

They are calculated from completely different data sources and answer completely different questions. The Margin of Safety reads the past. The Brina Gap reads the present economics and compares them against what the current stock price is assuming about the future.

When both point in the same direction simultaneously — DOUBLE DISCOUNT — the probability of genuine mispricing is high. The market is wrong on two independent dimensions at once, which is rare and significant.

The most dangerous scenario is not an overvalued stock — those are easy to avoid. It is a VALUE TRAP: a stock that appears cheap historically but where the market is already pricing in stronger growth than the business fundamentals support. Without the Brina Gap signal this looks identical to a genuine opportunity. The matrix separates them instantly.

The Brina Gap is the more powerful of the two signals. Most investors and analytical tools focus on valuation alone — whether a stock is cheap relative to earnings. Far fewer systematically compare what the business economics structurally support against what the stock price is actually assuming. That gap between fundamental growth potential and market expectations is where the most reliable mispricings live, and where this matrix earns its value.

Use this as your first filter. A stock in DOUBLE DISCOUNT territory is worth investigating. Everything else requires either more caution or a specific reason to act.

DOUBLE DISCOUNT OPPORTUNITY
DELTA AIR LINES, INC. (DAL) scores a Double Discount — Margin of Safety +66.1% against historical owner earnings and Brina Gap +4.4% against forward business economics. Both independent signals point to undervaluation simultaneously.
⚠ Owner Earnings and Free Cash Flow show moderate divergence (0.51×). Intrinsic Value and Brina Gap may be overstated — possibly from acquisition-related D&A. Treat both signals as upper bounds.
🎯 Expected Annual Return →
44.5%
Margin of Safety convergence — your return if the market re-prices to intrinsic value (5-yr annualised)
14.0%
Brina Gap convergence — your return if the market corrects the growth mispricing the Gap measures
18.0%
Yield + growth — what the business alone earns you, even if the market never re-rates
💰 How is Margin of Safety calculated? +
📈 How is Brina Gap calculated? +

Critical Financial Health Indicators

Return on Equity (Profitability):GOOD (19.3%)
Debt-to-Equity (Solvency Risk):AVERAGE (0.86x)
Operating Margin (Operational Efficiency):AVERAGE (8.1%)
Return on Capital (Capital Efficiency):AVERAGE (14.7%)
📊 Valuation Trilogy
Three interconnected metrics for complete valuation analysis
💎
Intrinsic Value
DCF Fair Value
$239.30
🛡️
Margin of Safety
Valuation Gap
66.1%
🎯
Expected Return
Projected Annual
44.5%
Click any metric for full methodology and detailed analysis
Zyberno's Verdict

According to Zyberno, DELTA AIR LINES, INC. (DAL) is a buy opportunity — AVERAGE BUSINESS (51/100) trading at a Margin of Safety of +66.1% against historical owner earnings, with a Brina Gap of +4.4% confirming the market is underestimating its forward growth capacity.

According to Zyberno's DCF model, DELTA AIR LINES, INC. (DAL) trades at $81.14 against an estimated intrinsic value per share of $239.30 — a +66.1% Margin of Safety based on Owner Earnings of $5.93B TTM, projected at 16.4% growth for 10 years with a 2.5% terminal growth rate. The Brina Gap of +4.4% strengthens the case: based on the company's ROIC (14.7%) and reinvestment rate (46.7%), the business can fundamentally grow at 6.8% — but the current enterprise value implies the market expects 2.5%. This places DAL in the Double Discount quadrant of the Brina Matrix, the rarest and most attractive position. Zyberno's model translates this into a 5-year expected return of 44.5% annually.

Over the trailing twelve months, DAL generated $5.93B in Owner Earnings. Capital was deployed as follows: $639.00M paid as dividends, $4.48B invested in capital expenditures. Reinvestment rate: 46.7%. Owner Earnings have grown at 16.4% annually over the trailing five years using log-linear regression.

DIVISION I: EXECUTIVE SUMMARY
A. Market Valuation

Market Price & Capitalization (2)

Current Price:81.14
Market Cap:$53.07B

Valuation Multiples (4)

P/E Ratio:
13.48x
📊 Click to view full DAL P/E analysis →
P/B Ratio:2.43x
P/S Ratio:0.78x
Peg Ratio:-999.00x

Enterprise Metrics (3)

Enterprise Value:$61.31B
Ev Ebitda Ratio:7.62x
Pfcf Ratio:13.53x

Price Action & Momentum (3)

12-1 Momentum:
+61.6% (91th pctile)
📈 Click to view full DAL Momentum analysis →
Momentum Percentile:91 / 100
% of 52-Week High:84.8%
B. Profitability Assessment

Return Metrics (7)

ROE:
19.3%
📊 Click to view full DAL ROE analysis →
ROA:4.8%
Roic:
14.7%
📊 Click to view full DAL ROIC analysis →
Reinvestment Rate:46.7%
Fundamental Growth Rate (g):6.8%
Market-Implied Growth Rate:2.5%
Brina Gap:
4.4%
☷ Click to view full DAL Brina Gap analysis →
MOD CONF

Margin Analysis (3)

Operating Margin Ttm:8.1%
Net Margin Ttm:5.8%
Ebitda Margin:11.8%

TTM Performance (2)

Operating Margin Ttm:8.1%
Net Margin Ttm:5.8%

Yield Metrics (3)

Earnings Yield:$7.42
Owner Earnings Yield:$11.17
Dividend Yield:1.2%
C. Log-Linear Regression Growth Trends

Earnings Surprise (SUE) (3)

Earnings Surprise (SUE):
-1.12
📊 Click to view full DAL Earnings Surprise analysis →
EPS Surprise vs Expected:-34.0%
Latest Earnings Filed:2026-07-10

Revenue Growth (Linear) (1)

Revenue Growth Rate (Linear):6.8%

Earnings Growth (Linear) (1)

Net Income Growth Rate (Linear):14.3%

Cash Flow Growth (Linear) (2)

Free Cash Flow Growth Rate (Linear):-10.8%
Operating Cash Flow Growth Rate (Linear):12.3%

Operating Growth (Linear) (1)

Operating Income Growth Rate (Linear):-8.9%
D. Financial Stability

Liquidity Ratios (3)

Current Ratio:0.42x
Quick Ratio:0.42x
Cash Ratio:0.14x

Leverage Analysis (3)

Debt To Equity Ttm:0.86x
Debt-to-Equity Ratio:0.86x
Debt To Ebitda:1.60x

Coverage Ratios (1)

Times Interest Earned:-999.00

Capital Structure (4)

Working Capital:-19,368,000,000.00
Cash And Cash Equivalents:4,665,000,000.00
Long Term Debt:$10.10B
Net Debt:$8.24B
DIVISION II: FINANCIAL STATEMENTS ANALYSIS
A. Income Statement Analysis

Revenue Components (2)

Revenue TTM: $68.29B
Linear Growth: 6.8%
📊 Click to view full DAL Revenue analysis & methodology →
Cost Of Revenue Ttm:$0.00

Profitability Breakdown (2)

$0.00
Operating income TTM: $5.52B
Linear Growth: -8.9%
📊 Click to view full DAL Operating Income analysis & methodology →

Bottom Line Performance (3)

Net income TTM: $3.95B
Linear Growth: 14.3%
📊 Click to view full DAL Net Income analysis & methodology →
Income Before Tax:$5.09B
Ebitda Ttm:8,041,000,000.00

Operating Expenses (5)

Operating Expenses:62,771,000,000.00
R And D Expense:0.00
Sga Expense:2,576,000,000.00
Income Tax Expense:$1.14B
Interest Expense:0.00

Expense Ratios (3)

R And D To Revenue Percentage:0.0%
Sga To Revenue Percentage:13.0%
Ebitda Margin:11.8%
B. Balance Sheet Analysis

Asset Composition (5)

Total Assets:$86.32B
Current Assets:$14.24B
Ppe Net:0.00
Goodwill:9,753,000,000.00
Intangible Assets:$5.96B

Liability Structure (4)

Total Liabilities:64,506,000,000.00
Current Liabilities:33,604,000,000.00
Long Term Debt:$10.10B
Short Term Debt:$2.80B

Equity & Capital (3)

Equity:$21.82B
Retained Earnings:$14.27B
Common Stock:1,500,000,000.00

Working Capital Items (3)

Accounts Receivable:4,307,000,000.00
Inventory:0.00
Accounts Payable:6,738,000,000.00

Special Items (2)

Contract Liabilities:0.00
Stock Based Compensation:313,000,000.00
C. Cash Flow Analysis

Operating Activities (2)

Operating cash flow TTM: $8.40B
Linear Growth: 12.3%
Free cash flow TTM: $3.92B
Linear Growth: -10.8%
📊 Click to view full DAL Free Cash Flow analysis & methodology →

Investment Activities (2)

Investing Cash Flow:-$1.26B
Capital Expenditures Ttm:4,475,000,000.00

Financing Activities (3)

Financing Cash Flow:-$435.00M
Dividends Paid Ttm:639,000,000.00
Stock Repurchase:0.00

Capital Transactions (3)

Common Stock Issuance:0.00
Long Term Debt Issuance:$0.00
Long Term Debt Repayments:$0.00

Non-Cash Items (1)

Depreciation Amortization Ttm:2,525,000,000.00
DIVISION III: OPERATIONAL METRICS
A. Per Share Analysis

Earnings Per Share (3)

EPS (Basic TTM):6.08
Eps diluted TTM: $6.02
Linear Growth: 13.2%
📊 Click to view full DAL EPS analysis & methodology →
Earnings Per Share Ttm:$6.04

Revenue & Cash Per Share (3)

Sales Per Share Ttm:104.41
Operating Cash Flow Per Share:$12.76
Fcf Per Share Ttm:6.00

Book Value & Capital (2)

Book Value Per Share:$33.36
Cash Per Share:7.13

Dividend Policy (1)

Dividend Payout Ratio:11.14x
B. Operational Efficiency

Asset Utilization (2)

Asset Turnover Ttm:0.82x
Working Capital Turnover Ttm:-999.00x

Receivables Management (2)

Receivables Turnover Ttm:15.85x
Days Sales Outstanding Ttm:23.02

Inventory Management (2)

Inventory Turnover Ttm:-999.00x
Days Inventory Outstanding Ttm:-999.00

Payables & Cash Cycle (2)

Days Payable Outstanding:36.02
Cash Conversion Cycle:-1,011.99
C. Quality & Risk Metrics

Financial Quality Scores (2)

Financial Strength Score:40.00
Quality Score:85.00

Market Metrics (2)

Beta:0.00x
Volatility Category:unknown
DIVISION IV: INVESTMENT ANALYSIS
A. Value Investment Framework

Owner Earnings Analysis (3)

Owner earnings TTM: $5.93B
Linear Growth: 16.4%
📊 Click to view full DAL Owner Earnings analysis & methodology →
Owner Earnings Per Share:$9.06
Owner Earnings Yield:$11.17

Growth Assessment (1)

Owner Earnings Growth Rate:$16.42

Damodaran Growth Analysis (4)

Reinvestment Rate:46.7%
Fundamental Growth Rate (g):6.8%
Market-Implied Growth Rate:2.5%
Brina Gap:
4.4%
☷ Click to view full DAL Brina Gap analysis →
MOD CONF

Intrinsic Value Models (1)

Intrinsic Value:
$156.50B
📊 Click to view full DAL DCF valuation →

Margin of Safety (1)

Margin Of Safety:
66.1%
📊 Click to view full DAL valuation analysis →

Return Scenarios (2)

Theoretical 5-Year Return:
44.5%
📊 Click to view full DAL expected return analysis →
Forward Expected Return (Yield + Growth):
18.0%
📊 Click to view full DAL expected return analysis →

Investment Assessment (1)

Buffett Assessment:Excellent margin of safety
B. Log-Linear Regression Growth Analysis

Growth Rates (Log-Linear Regression) (3)

Revenue Growth Rate (Linear):6.8%
Net Income Growth Rate (Linear):14.3%
Operating Income Growth Rate (Linear):-8.9%

Cash Flow Growth Rates (2)

Free Cash Flow Growth Rate (Linear):-10.8%
Operating Cash Flow Growth Rate (Linear):12.3%

Other Growth Rates (2)

Book Value Growth Rate (Linear):57.4%
Owner Earnings Growth Rate:$16.42
C. Company Profile & Context

Corporate Information (6)

Symbol:DAL
Company Name:DELTA AIR LINES, INC.
Sector:Unknown
Industry:Airlines
Exchange:NYSE
Country:United States

Market Classification (3)

Market Cap Category:N/A
Price Category:high
Volume Category:N/A

Share Structure (3)

Shares Outstanding:654.00M
Shares Outstanding Basic:654.00M
Shares Outstanding Diluted:658.00M

Data Processing Info (3)

Processing Version:v3.0
Last Updated:2026-08-28 14:23:34 UTC
Data Timestamp:2026-08-28T14:23:34.014433
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