Some passengers aboard a Frontier flight who were evacuated when their plane hit a man on the runway plan to take action against the City and County of Denver, arguing negligence.  Federal investigators are investigating the May 8 runway fatality at Denver International Airport, where 41-year-old Michael Mott allegedly scaled a fence and entered an active runway before being struck by the departing plane — Frontier Flight 4345.  More passengers will file claims in the future, Joe LoRusso, an aviation attorney with Ramos Law, one of the two law firms representing the passengers, told The Denver Gazette. LoRusso said that a “notice of claim” is set to be delivered to Denver on Wednesday afternoon, asking, among other things, for the city to waive its protection under the Colorado Governmental Immunity Act, a law that protects state and local government entities from tort or injury-based lawsuits.…