Directors of UAL have approved the acquisition of Frontier Airlines from People Express by UAL's United Airlines subsidiary . . . Walt Disney Co. said a regional council in France approved plans for Disney's proposed theme park near Paris . . . Asher Edelman said that FH Acquisition is extending its tender offer for any and all shares of Fruehauf Corp. until 6 p.m., EDT, Friday, July 25 . . . Spinner Corp. of San Mateo, Calif., has offered $108 million to acquire Princeville Development Corp., developer and operator of a major resort on the island of Kauai, Hawaii . . . American Motors raised by 2.9%, or about $235, the suggested retail prices of its 1986-model, U.S.-made Renault Alliance and Encore subcompacts.