BA calendar call spread: selling time twice

$216.14Boeing Company · chain snapshot captured Aug 1, 2026

Headline-driven vol on an industrial balance sheet. IV stays elevated because the tail risk is genuinely fat — regulatory and safety news can reprice the stock 10% on a Tuesday with no earnings in sight.

A calendar sells the Aug 28 $215 call and buys the same strike Sep 18 — $260 debit on BA at $216.14. You are not betting on direction; you are betting that the 27-day option decays faster than the 48-day one you own, which it does, as long as BA stays near $215.

The trade, priced from the chain

27d to August 28, 2026

Leg	Qty	Price	Δ	IV	Cash
SellAug 28 $215 call	1	$9.30	0.55	35%	+$930
BuySep 18 $215 call	1	$11.90	0.55	34%	−$1,190

Net debit

$260

Max profit

$468

Max loss

$260

Chance of profit

47%

Breakevens

$203.16 / $229.51

−6.0% / +6.2%

$193.93 – $238.73 price rangespot $216.14breakeven $203.16 · $229.51P/L at near expiry

Open this calendar call spread in the builderLoads these exact legs and re-quotes them live. No account needed.

Every leg above is priced at the chain’s own quote — the identical number the builder will show you when you click through (last traded price), captured August 1, 2026 with a 15-minute delay. Only strikes whose print survives an implied-volatility check (within 20% of its own IV) and a no-arbitrage check across the ladder are priced here. Full methodology. Greeks, breakevens, max profit/loss and probability of profit are computed by OptionTracker’s engine at r = 4.2%. Educational analysis, not investment advice.

How a calendar call spread works

Same strike, two expiries. The short Aug 28 call decays on a steep curve; the long Sep 18 call decays on a shallow one. The difference between those two decay rates is the entire profit engine — which is why the position wants the stock to sit still.

Max profit occurs with BA pinned at $215 on August 28, 2026: the short call expires worthless and you still own a 21-days-longer call. The engine values that peak at $468 against the $260 debit, which is also the maximum loss.

Calendars are LONG vega, unlike most short-premium trades. The back month has more vega than the front, so rising implied vol helps you. At 34% ATM on the front expiry, BA is the 12th richest of the 20 underlyings on this site — calendars are best opened when front-month vol is rich relative to the back.

Because the legs expire on different dates, there is no single expiry payoff: the numbers on this page are marked to model at the near expiry (August 28, 2026) using each leg's own implied vol — the same convention the builder uses.

When it makes sense

Front-month IV is elevated relative to the back month (a flat or inverted term structure). You are selling the expensive expiry and buying the cheap one.
You want a defined-risk long-vega position. Max loss is the $260 debit.
You want to own the back-month call eventually and would rather be paid to wait for it.
You know whether you intend to exit on the implied-vol ramp or on the realized move, because those are different trades with different exits.

Where the risk actually is

Early assignment on the short call — particularly near an ex-dividend date — leaves you short 100 shares against a long back-month call. Manageable, but it turns a quiet position into a margin conversation.

Vol term structure can move against you: if back-month IV falls while front-month holds, the position loses on vega even with the stock exactly where you wanted it.

The decay is relentless and it is front-loaded against you in exactly the window most retail traders hold. A long-vol position with no exit plan is a slow, fully-predictable loss.

What BA's chain actually looks like

One of the few large caps where owning vol without a dated catalyst is defensible: the headlines that move this stock do not appear on a calendar, so a long strangle is a bet on the arrival rate of news rather than on a specific print.

BA's Aug 28 strikes are $5 apart near the money (2.31% of spot). That is a coarse ladder: one rung is a large fraction of the implied move, so precision on the short strike is an illusion. 5.8k contracts of open interest on Aug 28 is thin, and a structure that needs four separate fills will pay for it. 15 strikes on that expiry — 36% of the board — carry prints that agree with their own implied volatility and hold up across the ladder, and those are the strikes priced here. Adequate but not deep; the usable ladder is short, and wide condors here are wider than the book really supports.

The surface is close to flat: only 1.1% between the 25-delta put and the 25-delta call. With so little skew, the wings on either side cost about the same in vol terms — unusual, and worth exploiting if your view is one-sided. The term structure is flat inside 1.5% between the two captured expiries, so there is no calendar edge to harvest and no event visibly priced into one month over the other.

At 34% ATM implied vol, the Aug 28 options are pricing a one-standard-deviation move of $20.15 over 27 days — roughly −9.3% to +9.3%, or $195.99 to $236.29. The implied move is the market's bid for the exact thing this structure is long. Buying it at fair value and hoping is not a strategy.

The BA-specific failure mode: Assuming the risk lives on the earnings date. On Boeing it lives on every date.

Picking the strike on BA

The strike is your forecast for where BA sits on August 28, 2026, and the expiry gap sets how much time you're buying:

Band	What it means	When it fits
ATM strike	Maximum time-decay differential	The neutral construction, quoted above at $215.
OTM call strike	A directional lean upward	Cheaper, profits if the stock drifts toward the strike by the near expiry.
Narrow expiry gap	Front and back close together	Smaller debit, smaller edge. Decay differential needs room to work.
Wide expiry gap	27d vs 48d here	More vega, more debit, more exposure to term-structure moves.

The chain below shows the Aug 28 calls. Compare the ATM IV there with the back month: if the front is not richer, the calendar's core edge is missing.

Across the nine rungs below, the premium runs 20.2× from the cheapest strike to the richest — that curve is the whole strike-selection decision, drawn. Open interest concentrates at $230 on this expiry, which is usually where the fills are cleanest.

BA 2026-08-28 calls around the money: strike, distance from spot, mid price, delta, implied volatility and open interest.
Strike	vs spot	Mid	Δ	IV	% of spot	Ann.	OI
$200	−7.5%	$17.80	0.80	38%	8.2%	111%	24
$205	−5.2%	$14.45	0.73	36%	6.7%	90%	55
$210	−2.8%	$11.50	0.64	36%	5.3%	72%	53
$215used	−0.5%	$9.30	0.55	35%	4.3%	58%	208
$220	+1.8%	$6.55	0.45	33%	3.0%	41%	468
$225	+4.1%	$3.65	0.35	33%	1.7%	23%	116
$230	+6.4%	$3.12	0.27	33%	1.4%	20%	1.4k
$235	+8.7%	$2.15	0.19	33%	1.0%	13%	262
$245	+13.4%	$0.88	0.10	34%	0.4%	6%	169

BA calls expiring August 28, 2026· 15-min delayed capture · “Ann.” annualizes the mid as a percentage of spot over 27 days.

Managing the position

Close at 25–50% of the debit in profit. Calendars rarely reach theoretical max profit because that requires a pin.
Roll the short call out for a credit when it expires worthless — that converts the position into a diagonal and reduces basis on the long call.
Have a vega target as well as a price target. If the position is up because implied vol rose and the stock has not moved, that is the trade working — take it.
Roll the long leg out when the thesis is intact and the clock is not. Buying more time is usually cheaper than buying a new position at a worse implied vol.

Common mistakes

Opening calendars with a flat term structure

If the Aug 28 and Sep 18 expiries carry the same IV, you are paying for time without buying an edge.

Forgetting the legs expire separately

On August 28, 2026 you still own a Sep 18 call. That is a position, and it needs a plan of its own.

Mistaking a big move for a profit

The breakevens sit outside the implied move by the width of the spread you paid. A dramatic-looking session can still settle inside them.

BA calendar call spread FAQ

What is the max loss?

The $260 debit. It is realized when BA moves far enough in either direction that both calls converge in value at the near expiry.

Why does this page show a modelled payoff instead of an expiry payoff?

Because the legs expire on different dates — August 28, 2026 and the Sep 18 expiry. The engine marks the position to model at the near expiry using each leg's own implied vol, which is the only honest way to draw a calendar's P/L.

How much is BA expected to move by Aug 28?

The Aug 28 options imply a one-standard-deviation move of $20.15 — about 9.3% of the BA share price — over the 27 days to expiry. That is the market's estimate, not a forecast: roughly a third of the time the actual move is larger.

Is BA option skew favouring puts or calls?

Puts. On the captured Aug 28 chain the 25-delta put implies 1.1% more volatility than the 25-delta call, which is the market charging more for downside protection than for upside exposure.

Build it yourself

Everything above is one construction at one moment. Open it in the builder to drag strikes along the ladder, scrub the expiry, and watch max profit, breakevens and probability of profit recompute live against the real BA chain — free, no account.

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