BANGOR, Maine (WABI) - LifeFlight of Maine, the state’s only air ambulance service, has opened registration for the Cross for LifeFlight, its largest fundraising event of the year. The event runs throughout August, and a new family-fun 5K has been added this year. About the Cross for LifeFlight Participants raise money by logging miles doing something they love — walking, running, swimming, biking, hiking or paddling. Participants can take part in the month-long challenge, the 5K, or both.