DAL, Delta Air Lines Inc.

Will it survive?

• Can it pay its interest? 14.7×
  Comfortable
  Operating income $5.8B ÷ interest expense $396M
  What this means

  Operating profit covers interest with the kind of margin Graham wanted for a defensive holding. Necessary, not sufficient, it says solvent, not cheap.

• How heavy is the debt, net of cash? $11.1B · 1.9× operating profit
  Modest net debt
  Cash $4.3B − debt $15.4B
  What this means

  Netting $4.3B of cash and short-term investments against $15.4B of debt leaves $11.1B owed, about 1.9× a year's operating profit (2.7× on the gross debt, before the cash). Net debt is the leverage figure that matters: the cash is already set against the debt. Strategic or illiquid investments aren't counted here.

• How long is cash tied up? —
  Not enough data
  What this means

  The filing data didn't include the inputs for this check.

Is it a good business?

• Return on invested capital 16%
  High through the cycle
  10-yr median, range -46%–30%; 15% latest = NOPAT $4.7B ÷ invested capital $32.0B
  Industry peers: median 8%
  What this means

  The rate the business earns on the money tied up in it, Buffett's north star, because over time a stock tracks the ROIC beneath it. Above ~15% sustained hints at a moat; a return below the cost of capital (~8%) erodes value as a business grows rather than building it — the test Buffett weighs most. The headline is the median of the last 10 years (it ran 15% most recently), so one peak or trough year doesn't set the verdict. Asset-light businesses (R&D expensed, little capital) read artificially high, pair this with Owner Earnings.

• Owner-earnings margin 8%
  Solid through the cycle
  10-yr median margin, range -33%–14%; latest $5.9B = operating cash $8.3B − maintenance capex $2.4B
  Industry peers: median 9%
  What this means

  What an owner could take out without starving the business: operating cash less the maintenance capital it must spend to hold its position — Buffett's owner earnings. That's 9% of revenue this year, a 8% median across 10 years. It chose to put $2.1B more into growth, so free cash flow this year was $3.8B — the gap is investment, not weakness. Treating stock comp as the real expense it is (less $161M of SBC) leaves $5.7B.

• Are earnings backed by cash? 1.67×
  Cash-backed
  Cash from ops $8.3B ÷ net income $5.0B
  What this means

  How much of reported profit showed up as operating cash. Above 1× is reassuring; well below suggests earnings lean on accruals. One year is noisy, growth and working-capital swings distort it, and this is operating cash, not free cash. Watch the multi-year trend.

How is the cash used?

• Where do the earnings go? 7%
  Reinvests most of it
  Dividends + buybacks $440M ÷ Owner Earnings $5.9B
  What this means

  Of $5.9B Owner Earnings, $440M (7%) went back to shareholders, $440M dividends, $0 buybacks. Returning most of it is the mark of a mature business with little left to reinvest at a high return; reinvesting most could mean a long runway, or empire-building. The split doesn't say which; the return earned on it (see ROIC) does.

• Investing or harvesting? 1.84×
  Expanding
  Capex $4.5B ÷ depreciation $2.4B
  What this means

  Descriptive, not a grade. Above ~1× means investing faster than assets wear out (growth, or, sustained for years, today's earnings carrying less depreciation than tomorrow's will). Below means spending less than it's wearing out (efficiency, or a melting asset base). The ratio won't tell you which; the filings will.

Graham’s defensive tests · 1 of 6 met

Graham’s numerical criteria for the defensive investor (The Intelligent Investor, ch. 14), run on the filings. A floor of safety, not a buy signal; many fine modern businesses fail his strictest liquidity rules by design.

• Adequate size Pass
  Revenue ≥ $2B · $63.4B
  What this means

  Big enough to weather a storm. Graham's 1972 floor was ~$100M of sales (≈ $700M today); we use a $2B revenue line as a conservative modern stand-in.

• Strong liquidity Miss
  Current ratio ≥ 2× · 0.40×
  What this means

  Current assets at least twice current liabilities, near-term bills covered without touching the business. Strict by design: many cash-rich modern firms run leaner and miss it, holding their cushion in longer-dated securities.

• Conservative debt Miss
  Debt ≤ working capital · $15.4B vs ($16.7B) WC
  What this means

  Graham's rule that borrowings not exceed net current assets. Capital-heavy and buyback-heavy firms routinely fail it, read it next to interest coverage, not alone.

• Earnings stability Near
  A profit every year (10-yr record) · 1 loss year
  What this means

  Graham wanted earnings in each of the past ten years, the stability a defensive owner leans on.

• Dividend record Miss
  Uninterrupted dividends · 8 of 10 yrs
  What this means

  An unbroken dividend was Graham's mark of durability. He wanted twenty years; the filings show about ten, and a single suspension breaks the streak. Non-payers, many fine modern compounders, fall outside his defensive net by design.

• Earnings growth Near
  Earnings +33% over the record · +15%
  What this means

  At least a third more earnings than a decade ago, averaging three years at each end. Net income (not per-share), so stock splits don't distort it, buybacks and dilution show up in the share-count line instead.

• Moderate price —
  P/E ≤ 15 and P/E × P/B ≤ 22.5 · decided by the price
  What this means

  Graham's valuation gate, the wall he kept between a sound business and a sound investment. Three-year average earnings are $6.63/share (latest year $7.61), the averaged base the calculator's gate runs on, and book value is $31.71/share. Enter a price in “What the price implies” just below for the P/E, P/B, and whether it clears. But this is the rule Buffett outgrew: there's no hard P/E law, and a wonderful business can deserve a far richer multiple if the thesis holds, treat it as the bargain-hunter's floor, not a verdict on the price.

Durability & moat, 2016–2025

Whether the record’s returns held, and what the capital reinvested earned.

• Profitable years 9 of 10
  What this means

  Lost money in 1 year(s), look at what happened there before trusting the average.

• Return on capital ≥ 15% 7 of 10 yrs
  What this means

  A moat shows up as a high return on invested capital that holds year after year, not one good vintage.

• Operating margin 15% → 9% (3-yr avg ends)

  In the filing’s words The filing attributes gains to higher prices, but the margin in the record has not followed — the claim outruns the result here.

  What this means

  Through the cycle the operating margin slipped — about 15% early to 9% lately, median 10% — competition or costs are biting in.

• Reinvestment, incremental ROIC 6%
  What this means

  Reinvested capital came back at only a modest incremental return — near the cost of capital, where extra growth adds little per dollar. The record shows whether it is a soft stretch or a thinning moat.

• Owner earnings growth +4%/yr
  What this means

  Owner earnings grew about 4% a year over the record.

• Worst year 2020 · −72.9% op. margin
  What this means

  Operations went underwater in 2020, understand why before trusting the good years.

• Share count −1.6%/yr
  What this means

  The share count is shrinking, buybacks are quietly growing your slice of the business.

• Dividend record paid
  What this means

  Paid a dividend in 8 of the years on record.

• How management talks about it Owner’s terms
  What this means

  The filing reasons in an owner’s terms — per-share, return on capital, the long term — and the record has held; the words and the results are of a piece.