Pilots at American Airlines Group Inc. are being told to delete and reload an app that provides navigational charts on their company-issued Apple Inc. iPads after a software glitch led to flight delays.

An American spokeswoman said the problem wasn't an in-flight safety issue. It occurred preflight and the fix didn't take long. No flights were canceled but 24 were delayed by up to 30 minutes Tuesday night and another 30 were delayed Wednesday morning.

"We are starting to see decreasing delays as pilots become aware they can reinstate the app," she said.

Pilots began experiencing the problem while still on the ground when they opened their iPads to an airport terminal map for Ronald Reagan Washington National Airport, said a spokesman for Boeing Co.'s Jeppesen Sanderson unit, which provides the navigation app. The app contained a duplicate of that map, which caused it to become unresponsive if pilots clicked on it.

Jeppesen updates American's charts every two weeks, and the new version is scheduled to become effective May 8.

American figured out the problem Tuesday night, the spokeswoman said, and began alerting pilots who signed in for work. They were told to delete the Jeppesen app and download the same version. Some aviators had to bring their planes back to the gate where they could access airport Wi-Fi from the cockpit. Pilots aren't allowed to connect to the Internet in-flight.

Most major U.S. airlines now issue iPads or other tablet devices to their pilots to store digital copies of navigation charts, flight manuals, emergency checklists and other documents that the aviators formerly lugged around in heavy briefcases. The Federal Aviation Administration has approved the switch, and pilots say having the documents available at the touch of a tablet is quicker and easier.

American rolled out its program in 2013, around the same time as rivals including United Continental Holdings Inc., Southwest Airlines Co., JetBlue Airways Corp. and Alaska Air Group Inc.'s Alaska Airlines.

Jeppesen supplies charts to those airlines, among others, the spokesman said, but American's app is unique to the airline. The American glitch "is the first time we've ever seen this," he said, adding that the company is investigating.

Not all of the flights delayed were necessarily headed to Reagan National Airport. Any pilot who even glanced at that chart would have triggered the app problem and need to reload it. American doesn't carry backup paper versions of terminal charts in its cockpits, the spokeswoman said.

Jeppesen said temporary workarounds for pilots headed for Washington could include the issuance of a paper version of the terminal map or a PDF file containing the digital version of the chart sent into the iPad but outside of the app.

Write to Susan Carey at susan.carey@wsj.com

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