April 1 (Reuters) - United Parcel Service ( UPS ) will

become the United Stated Postal Service's (USPS) primary air

cargo provider, the company said on Monday.

Rival FedEx ( FDX ), which counted USPS as the largest

customer for its air-based Express segment, has said it was

seeking a more profitable contract with the postal service

provider.

FedEx's ( FDX ) contract with the USPS is set to expire on Sept.

29.

(Reporting by Ananta Agarwal in Bengaluru; Editing by Savio

D'Souza and Varun H K)