UPDATE 2-JetBlue would get slots in DC's Reagan DC

* AirTran, Spirit WestJet would also get slots

* Delta, US Airways seeking final US gov't approval

* US Airways, Delta aim to beef up separate markets

WASHINGTON, March 22 (Reuters) - JetBlue Airways (JBLU.O) would for the first time gain coveted takeoff and landing rights at Washington's close-in Reagan National airport under a wider plan by bigger rivals to shake up East Coast access rights.

Delta Air Lines (DAL.N) and US Airways (LCC.N) are proposing to transfer 12 percent of their slots at Reagan National and New York's LaGuardia to JetBlue and three other airlines to satisfy regulators reviewing their ambitious plan to restructure their networks in the two cities, regulatory filings show.

AirTran Airways AAI.N, privately held Spirit Airlines and Canada's WestJet (WJA.TO) would also get slots from Delta and US Airways.

Slots are controlled by the Federal Aviation Administration (FAA).

The FAA in February tentatively approved the plan by Delta and US Airways on the condition they divest a certain number of flights at both airports.

Under the terms of that plan, US Airways would transfer 125 slots at LaGuardia to Delta. Regulators said 20 slots would have to be transferred to other airlines. US Airways sought 42 slots in Washington from Delta, and regulators said 14 would have to go to other carriers.

JetBlue would get five round-trip flights from US Airways at Reagan National under the counterproposal unveiled on Monday.

A JetBlue spokeswoman said JetBlue has wanted access to Reagan National but never had the opportunity since slots open infrequently. JetBlue currently offers service from Washington Dulles, which is 25 miles west of downtown, in Virginia.

US Airways hoped the unusually large deal, which is structured as asset sales without any exchange of cash, would help overhaul its route network and play to its strength in Washington.

Delta has ramped up New York service over the past five years with new international service at John F. Kennedy airport and more flights at LaGuardia.

US Airways President Scott Kirby called the FAA's requirement to give up slots legally questionable, but said on Monday in a memo to employees that a court challenge would be expensive and time consuming.

"This move would improve our stability over the long term and would accelerate our path back to sustained profitability," Kirby said. (Reporting by John Crawley; Editing by Gary Hill)