With jet fuel costs remaining at historic highs amid the Iran war and the closure of the Strait of Hormuz, multiple airlines have been forced to trim their networks to prioritize only the most profitable routes.

National airlines such as Air France, KLM, and Lufthansa all canceled dozens of flights over the last month, while Lufthansa also shut down its CityLine regional airline a year earlier than initially anticipated to minimize unnecessary jet fuel use.

After trimming some routes between the U.S. and Canada over jet fuel concerns, Delta Air Lines made much more extensive cancellations over the weekend leading up to May 4 over what the Atlanta-based airline classified as weather issues. Still, it left some travelers with questions.

Delta Air Lines cancels hundreds of flights, blames the weather

According to flight-tracking data, Delta canceled 157 of its flights on Friday, May 1, 219 flights on Saturday, and 125 flights on Sunday. This amounted to up to 7% of the carrier’s total flight schedule on Saturday and a slightly less but still significant number on other days.

Many travelers took to social media to complain of abrupt cancellations and not being able to reach Delta representatives for help with their bookings. In one incident that went viral on multiple social media platforms, according to Simple Flying, a frustrated passenger at LAX seized the microphone at one of the airport’s gates to ask, “Delta, Delta, is anybody working?”

Related: Another airline shuts down over Iran war, all flights off

“Delta is a mess,” another wrote on X. “They’ve canceled it at the gate and we’re all awaiting bags at baggage reclaim, but the app hasn’t updated and says the flight is only delayed. What is going on?”

Beyond a brief statement saying the cancellations were caused by inclement weather, Delta offered almost no commentary on the situation. Given that there were no major weather-related events anywhere in the U.S. over the weekend, some speculated why the airline was canceling so many flights when competitors weren’t.

Delta cancellations frustrate passengers.

What’s behind all the Delta cancellations at the start of May

Shutterstock Aviation watchdog JonNYC wrote that Delta’s cancellation problem could be caused by pilot staffing problems that exacerbate minor weather issues or other problems.

“As far as the current situation, this definitely all seems to be directly related to DL’s systems and staffing,” the watchdog wrote. “The one small caveat to that is that there was a small hail-storm on Monday that might have kicked things off this time around to a degree, but no other major weather component — which as we know is the majority of time the catalyst.”

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More Travel News: Delta’s silence and departure from its usual reputation for reliability fueled significant passenger panic, especially in the wake of the collapse of Spirit Airlines a few days earlier.

The beleaguered low-cost airline was dealt the final blow when jet fuel skyrocketed and it was no longer able to stay afloat following two past bankruptcy filings.

In what is the biggest collapse in recent U.S. aviation history, the airline told passengers with any flights booked beyond May 2 to “look to rebook your travel on a different airline.”

Related: Major airline canceling Middle East flights ‘until later this year’