A United Airlines flight from Houston to Seattle was diverted to Boise, Idaho, Thursday after the pilot suffered a heart attack, airport officials said. United Flight 1603 landed at Boise Airport shortly before 8 p.m. and the pilot was transported to a hospital in unknown condition, KBOI-TV, Boise, reported. The Boeing 737 remained at the airport Thursday night as United officials sought a replacement pilot to complete the flight to Seattle, the TV station said.