WASHINGTON (AP) – The U.S. airline industry is slowly adding jobs — although not all carriers are growing.

The Transportation Department said Thursday that passenger airlines employed the equivalent of 383,610 full-time workers in March, up nearly 1 percent from a year earlier. It’s the fourth straight monthly gain.

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United Airlines had the most workers, 80,694, but that’s down 2.1 percent.

Dallas-based Southwest Airlines and its AirTran Airways subsidiary shrank by 1.4 percent.

Delta Air Lines added the most jobs, followed by US Airways, Fort Worth-based American Airlines and JetBlue.

Spirit Airlines and Allegiant Air grew fastest in percentage terms, both posting double-digit gains.

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