John Travolta's faith in Scientology has given him strength to deal with his son's death, his close friends told PEOPLE. "John goes to Clearwater, Fla., [where Scientology has a center] four days a week. He flies [the 15-minute distance] in his little plane every night, and it's helped him."

Over the weekend, Tom Cruise, Katie Holmes and daughter Suri reunited with Travolta and wife Kelly Preston -- plus over 4000 other Scientologists -- at a massive party in England.