Yousef assembled a bomb in the lavatory, set the timer to detonate four hours later, and put it in the lifejacket pocket under seat 26K on the right-hand side of the fuselage. The domestic flight attendant Maria Delacruz had noticed that Yousef kept switching seats during the course of the Manila to Cebu flight, but did not warn the new cabin crew boarding at Cebu of his behavior. Yousef and 25 other passengers left the plane at Cebu, where 256 passengers and a new cabin crew boarded for the trip to Tokyo. Many passengers were Japanese people; some were coworkers traveling as part of a tour group. Airport congestion delayed the departure of Flight 434 from Cebu for 38 minutes. All of the passengers had boarded by 8:30 a.m., with the bomb having been planted around two hours earlier. PAL 434 was cleared for takeoff at 8:38 a.m.