Airbus SE (EADSY) is dealing with yet another headache. Just as software recalls linked to a solar flare disrupted flight operations worldwide, the aircraft manufacturer has now identified a structural issue with its popular A320 aircraft. And if you're wondering how big a deal this might be, consider that American Airlines alone operates nearly 500 of these planes.

What's Wrong With the A320?

The problem involves metal panels on some A320 fuselages, and Airbus is pointing the finger at supplier issues, according to Reuters reporting on Monday.

When MarketDash reached out for details, an Airbus spokesperson confirmed that "the source of the issue has been identified." More reassuringly, the spokesperson added that the problem is now contained and "all newly produced panels conform to all requirements."

That's the good news. The less-good news is that this adds to the mounting challenges for Boeing Co. (BA)'s European rival, which has been fighting fires on multiple fronts.

How Many U.S. Airlines Are Flying These Things?

Quite a few, actually. The A320 family is enormously popular with U.S. carriers, and the fleet numbers are substantial.

American Airlines Group Inc. (AAL) leads the pack with more than 490 A320 family aircraft in its fleet, according to data compiled by SimpleFlying. That's a significant chunk of any airline's operations.

Delta Airlines Inc. (DAL) isn't far behind with over 315 aircraft from the A320 lineup. JetBlue Airways Corp (JBLU) operates 230 units, while United Airlines Holdings Inc. (UAL) has 194 in service.

American Airlines, Delta, United and JetBlue didn't immediately respond to MarketDash's request for comment.

Should Travelers Worry?

Transportation Secretary Sean Duffy doesn't think so. He's assured travelers that they won't face disruptions and delays despite the software problems affecting the A320 family of aircraft.

That's probably the right tone to strike for now, especially since Airbus says it has the fuselage issue under control. But for an industry still recovering from pandemic disruptions and dealing with intense scrutiny over safety, it's another reminder that aircraft manufacturing remains a complex business where even small supplier problems can ripple across thousands of flights.