When WTI jumps 10%, airline stocks fell in 25 of 38 months

By Elena Vasquez

In 25 of the 38 months when WTI rose at least 10%, the Dow Jones U.S. Airlines Index fell, according to a SignalPilotLabs analysis published on TradingView using monthly data from April 2001 through September 2026.

The chart behind that result tracks a market link rather than a refinery margin. From the end of June to October, WTI climbed from 70.56 to 103.37, a 46.5% increase. Over the same period, the airline index dropped from 309.34 to 244.44, or 21.0%.

Fuel ranks among an airline’s largest costs, but the study asks whether that exposure creates a dependable equity pattern.

What did the study test?

SignalPilotLabs used TradingView monthly closes for the Dow Jones U.S. Airlines Index (DJ:DJUSAR) and FRED’s DCOILWTICO WTI crude oil spot series. The record covered 306 months from April 2001 to September 2026. It classified 38 months as oil-up, when WTI closed at least 10% above the prior month, and another 38 as oil-down, when it closed at least 10% below.

For each group, the author tested whether the airline index fell or rose during the same month and the following month, then compared those readings with all other months. SignalPilotLabs said it wrote the four tests and the decision threshold before measuring any month.

The design makes the result reproducible, but it still measures a link rather than the cause of each equity move.

Does the same-month oil-up signal hold?

The airline index fell in 25 of the 38 oil-up months, or 65.8%. It fell in 45.9% of all other months. The study’s typical oil-up month produced a 3.3% index decline, while a typical month without a large oil move produced a 1.2% gain.

The author drew 38 months at random from the record 10,000 times. Only 179 samples produced 25 or more airline-index declines, and the same-month pattern held in both halves of the record. Through 2013, 14 of 20 oil-up months saw a fall, or 70.0%, against 46.6% in other months. Since 2014, 11 of 18 fell, or 61.1%, against 45.2%.

SignalPilotLabs concluded: “in this record, airline stocks fell more often in the months oil jumped.”

The same-month relationship clears the study’s own pre-set threshold, although it does not explain why the equities moved.

Does an oil slump give a cleaner signal?

In the 38 oil-down months, the airline index rose in 21, or 55.3%, compared with 51.1% in other months. Random samples produced results at least as strong in 3,831 of 10,000 draws, so this side failed the test. Since 2014, the relationship ran the other way.

An oil decline offers no dependable same-month lift for airline stocks in this record.

Does the move continue 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 readings leaned in the expected direction, but random sampling produced results at least as strong in 1,896 and 1,543 of 10,000 draws, respectively. SignalPilotLabs therefore found no rule for either month-after move.

Neither the post-surge decline nor the post-slump rebound clears the study’s test.

What did the largest moves show?

Oil’s biggest monthly gain was 85.0% in May 2020, while the airline index slipped only 0.7%. In March 2026, WTI gained 53.6% and the airline index lost 11.9%. Oil’s biggest fall came in March 2020, when it dropped 54.2% and the airline index crashed 36.8%.

The latest oil-up month in the record, September 2026, brought an 11.7% oil gain. The airline index rose 3.9%; it was one of 13 oil-up months when the index advanced. In October, outside the record and its 10% threshold, oil rose 6.4% and airline stocks fell 4.6%.

The size of an oil move alone cannot explain the airline equity response.

What does the chart show?

The airline index appears monthly on a log scale from April 2001 through September 2026, with WTI plotted below it. Equal steps on the scale represent equal percentage moves. A short mark identifies each oil-up month: orange when the airline index fell and gray when it rose.

Of the 38 marks, 25 are orange. A panel beneath the candles gathers them into one row.

The graphic reinforces the same-month count rather than a timing rule for the following month.

What should downstream readers take from it?

For a downstream fuel desk, the study stops at the equity response: it uses WTI and a broad airline index, with monthly closes as its unit of analysis. The evidence is an index and past data, not individual airline results. It does not identify why a month moved, listing fuel hedging, demand and a crash as examples, nor does it forecast where oil goes next.

FRED’s daily series runs a few days behind, so the October oil value may not represent the month’s final close. SignalPilotLabs ended with the caveat: “Observations, not recommendations.”

The watch item is the next monthly close: whether WTI moves by at least 10% and whether the airline index falls in that same month, rather than relying on an unsupported rebound call for the month after.