A once-empty parking lot at Northrop Grumman Corp.’s top secret aircraft plant in Palmdale is now jammed with cars that pour in during the predawn hours.

More than a thousand new employees are working for the time being in rows of temporary trailers, a dozen tan-colored tents and a vast assembly hangar at the desert site near the edge of urban Los Angeles County.

It is here that Northrop is building the Air Force’s new B-21 bomber, a stealthy bat-winged jet that is being designed to slip behind any adversary’s air defense system and deliver devastating airstrikes for decades to come. The Pentagon is aiming to buy 100 of the bombers by the mid-2030s for at least $80 billion, though the exact amount is classified.

Northrop won the bomber contract in 2015, but the pace of activity is ramping up sharply under an Air Force budget that has reached $2 billion for this fiscal year.

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