ST. LOUIS (AP) _ Trans World Airlines and America West Airlines have entered into a code-sharing pact that will give passengers access to 145 cities in the United States and abroad.

TWA and America West said Wednesday they will begin accepting bookings in first quarter 2001 on more than 500 flights the airlines operate. The agreement is subject to government review and other appropriate approvals.

The agreement is known as a code share. It allows one carrier to book seats on the other's flights, thus expanding the domestic and international reach of both carriers. At check-in, passengers receive boarding passes on both airlines for their connecting flights. The deal also gives passengers reciprocal access to both airlines' frequent-flier airport clubs.

TWA, based in St. Louis, will be able to book passengers on flights to 84 America West destinations. Thirty-three of those destinations are new to the TWA route map, including leisure destinations like Aspen and Telluride, Colo., and Acapulco and Guadalajara, Mexico.

Customers of America West, based in Tempe, Ariz., will be able to book flights to 61 TWA destinations. Thirty-nine of those destinations are new to the America West network, including Charlotte, N.C.; Knoxville, Tenn.; Richmond, Va.; Kona, Hawaii; and San Juan, Puerto Rico.