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“We’re glad that A.F.A.’s calling attention to the issues appears to have led Delta to update its policy several times and communicate this to workers,” Ms. Nelson said in her letter, which was addressed to Delta’s chief executive, Ed Bastian.

“My responsibility as the president of the A.F.A. is to work for the safety of my people, which is why I made this decision,” the associations’s president, Claudio Tapia, said in a short statement to the news media in Barcelona.

“When it became known that it would be in Jerusalem, the first thing we did was get in touch with A.F.A. to alert them about the sensitivity and delicate situation that this implied, including because it could involve security issues,” the Argentine foreign minister, Jorge Faurie, said in an interview with local radio station Mitre.

“Disruptions in the cabin have increased in recent years,” Corey Caldwell, a spokeswoman for the A.F.A., said in an email.

There is no note making a request to the A.F.A., but the executive committee only meets today.