jobs —although they, too, areskyjackerSEATTLE lt;UPI)—It was a case of mistaken identity, but Bill Whitney admits he was almost a perfect suspect.The 33-year-old champion skydiver was questioned over five hours by the FBI in their search for the man who hijacked a. plane Nov. 24 and parachuted with $200,000 ransom.Whitney said Sunday that he wears dark glasses, lacked a strong alibi, »vas coholder of the Northwest sky-jumping altitude record and looked remarkably like an FBI sketch of the skyjacker.“I know a lot of jumpers up and down the coast. I understand a lot of them looked at that sketch and thought of me,” he said.Whitney, interrogated by FBI agents Thursday, said he didn’t think the daring skyjacking feat was very difficult.“I could have done it, yes, but I didn’t,” said the bachelorbusinessman, whose height, weight, age and complexion were different from those given the aerial bandit.The skyjacker bailed out of a Northwest Airlines 727 jetliner after showing the stewardess what he said was a bomb and released' the passengers in Seattle for $200,000 and four parachutes The FBI said the man, who called himself I) H Cooper” could have jumpedKpno, Nev., where the pilot had been ordered to go for refuelingHe couldanywhere between Seattle and