Airlines spent much of the last year worrying about having too many employees after travel demand plummeted. Now they’re trying to avoid the opposite problem as customers return and the pandemic’s impact starts to abate.

Southwest Airlines is the latest airline to address that issue and is planning to resume hiring flight attendants in the coming weeks, according to note to cabin crews, which was seen by CNBC.

Rivals including American Airlines, United Airlines and Delta Air Lines have recently announced they plan to resume hiring pilots, in hopes they will be able to cater to a rise in travel demand in the coming years, while hundreds of aviators near the federally mandated retirement age of 65.

The Dallas-based airline recently said it planned to recall flight attendants who took temporary leave, at the company’s urging, next month.

“In order to support future operational needs, all Flight Attendants have been recalled to work effective June 1, and we will need to hire Flight Attendants in the immediate future,” said the staff note.

Hiring will begin with candidates who had conditional job offers when the pandemic froze hiring last year.