ONTARIO - New Boeing 737 twinjet passenger planes will be used on Western Air Lines flights out of Ontario beginning July 18.The 737, newest of tlie Boeingfamily of jets, carries 107 passengers and cruises at speeds up to 585 miles per hour.“As far as we know,” a Western Air Lines spokesman in Los Angeles said, “this will be the first time a 737 twinjet has been seen in California.”30 OrderedWAL officials said the company has ordered 30 of the $3 25-million aircraft for delivery in the next 13 months.This will permit the airline to provide jet service on all flights to Ontario, transferring its Lockheed Electras to all-cargo and intra-Alaska services, according to Robert Cheadle.WAL’s Ontario district sales manager.With the new aircraft in use.the company will inaugurateimproved service next year between Ontario and Portland, Seattle, Sacramento and Salt Lake City, a spokesman said.WAL presently serves Portland and Seattle from Ontario by means of a plane change at Los Angeles or San Francisco.Western offers one-plane service from Ontario to Sacramentoand Oakland through l»s Angeles.AuthorizedThe airline was authorized by tin* Civil Aeronautics Board to serve Salt Lake City “a numberof years ago,” company spokesmen point (Hit, but the* route has not been flown, principally because of a lack of equipment Seventeen 737s will be deliv ered between June and Decern ber and 13 in the first half of 1 ‘#9.The company also will receivefive Boeing 707-320C Inter continentals this summer andpreliminary agreement has been reached for purchase of six Boeing 727-20Qs for delivery in 1969.“The addition of these aircraft will make it possible for Western to expand its schedule out of Ontario and we will do so as soon as possible, hopefully early next year,” Cheadle said.Flying time for the twinjet from Ontario to San Francisco will be 62 minutes, the same asfor three-and four-engine jets.In Western's initial schedules Ontario will have 737 twinjet service to Los Angeles, Oakland, Palm Springs and San Francisco. Other 737 service will be added as the airline takes delivery of additional aircraft.“The 737 is a perfect airplane for the commuter market.” said Cheadle. “It has the same wide fusilage as the larger Boeing jets. \et is small enough to maneuver easily on theground.”mmit-umniiinii-1-n.wn-u.Boeing 737 Holds 107 Passengers, Cruises Over 500 M.P.H