A power outage caused some flight delays Monday for holiday travelers at Michigan's Gerald R. Ford International Airport, which was left without heat in the passenger terminal, AP reported. The Grand Rapids airport lost primary power to its passenger terminal building about 8:45 p.m. Sunday and the outage continued Monday, airport spokesman Bruce Schedlbauer said. The airport operated using backup power late Sunday and Monday. «We are able to operate some of the systems on backup power,» Schedlbauer said. The cause was under investigation, he said. Some flights were diverted from the airport Sunday, but flights were taking off and landing Monday. Schedlbauer said he did not have details about how many flights had been delayed or canceled. The air field, control tower and communications, navigation and security systems all had power, Schedlbauer said. But there was limited lighting in the terminal, and there was no heat in the building.