By Elena Vasquez

The Dow Jones U.S. Airlines Index fell in 25 of the 38 months when WTI crude closed at least 10% above the prior month, a 65.8% rate versus 45.9% in all other months.

SignalPilotLabs’ 306-month test identifies a same-month association, not proof of causation and not a dependable one-month forecast.

From the end of June to October, WTI crude rose from $70.56 to $103.37, a 46.5% increase, while the Dow Jones U.S. Airlines Index fell from 309.34 to 244.44, a 21.0% decline.

SignalPilotLabs cited fuel as one of an airline’s biggest costs, then tested whether that cost link behaved like a rule.

What did the test cover?

• Monthly closes came from TradingView’s Dow Jones U.S. Airlines Index (DJ:DJUSAR) and FRED’s WTI crude oil, spot series (DCOILWTICO), spanning April 2001 through September 2026: 306 months.
• An oil-up month closed 10% or more above the previous month; 38 qualified. An oil-down month closed 10% or more below the previous month; another 38 qualified.

SignalPilotLabs said: “We wrote the four tests and the bar down before measuring a single month.” The tests compared airline-index performance during each oil-up or oil-down month and the following month with all other months.

How strong is the same-month relationship?

In the 38 oil-up months, the airline index fell 25 times, or 65.8%, against 45.9% in all other months. The typical oil-up month produced a 3.3% decline; a typical month with no big oil move produced a 1.2% gain.

In the 38 oil-down months, the index rose 21 times, or 55.3%, against 51.1% in other months, making the reverse relationship weaker than the oil-up result.

SignalPilotLabs drew 38 months at random from the record 10,000 times; only 179 draws produced 25 or more airline-index falls. The result held in both halves of the record.

• Until 2013, airline stocks fell in 14 of 20 oil-up months, or 70.0%, against a 46.6% fall rate in other months.
• From 2014 onward, they fell in 11 of 18 oil-up months, or 61.1%, against 45.2% in the other months.

The oil-down side failed that standard: 3,831 of 10,000 random draws matched the result, and from 2014 the relationship ran in the opposite direction.

Does the signal survive into the next month?

After an oil-up month, the airline index fell in 21 of 37 cases, or 56.8%, against 47.4% in other months. After an oil-down month, it rose in 23 of 38 cases, or 60.5%, against 50.2%.

Both leaned in the expected direction, but random draws matched them in 1,896 and 1,543 of 10,000 trials, respectively; SignalPilotLabs classified both as no rule.

What do the largest oil moves show?

• May 2020: Oil recorded its largest monthly gain, 85.0%, while the airline index fell 0.7%.
• March 2026: Oil rose 53.6%, and the airline index fell 11.9%.
• March 2020: Oil posted its largest monthly decline, 54.2%, while the airline index suffered its own crash of 36.8%.
• September 2026: The latest oil-up month in the sample gained 11.7%, while the index rose 3.9%, one of 13 oil-up months with gains.
• October, outside the test: Oil rose 6.4%, while airline stocks fell 4.6%.

The chart plots the airline index monthly on a log scale from April 2001 through September 2026, with equal steps representing equal percentage moves and WTI below it. Short marks identify oil-up months: orange when the index fell, grey when it rose. A panel beneath the candles gathers the marks in a row, with 25 of 38 orange.

What can investors conclude?

SignalPilotLabs stated the usable conclusion narrowly: “When oil jumps 10% or more in a month, the record says airline stocks have more often fallen in that same month.” The study offered no firm rule for the following month and no reliable lift for airline shares after an oil slump.

The analysis cannot establish why a month moved: fuel hedging, demand and a crash remained possible explanations. It also cannot isolate any single airline or forecast where oil goes next. Its evidence consists of one index, monthly closes and past data.

FRED’s daily series runs a few days behind, so its October value may not represent the month’s final day.

SignalPilotLabs characterized the work as observations rather than recommendations: across 306 months, a double-digit oil increase coincided with a higher historical odds of an airline-index decline in the same month, while the next month and an oil slump offered no dependable directional signal.