WASHINGTON, May 30 (Reuters) - United Airlines

can take delivery of new airplanes as U.S. aviation regulators

review the carrier, the head of the Federal Aviation

Administration said Thursday.

"We are permitting them to take deliveries of aircraft. Most

of those aircraft have been one-on-one replacements for missing

aircraft," FAA Administrator Mike Whitaker told reporters at a

briefing. "Some of it has been growth. They have provided us

with their growth plan, and we're working with them on that

growth plan going forward."

Some airline certification activities were halted after the

FAA said in March it was increasing its oversight of United

following recent safety incidents.