Mirabel is still used by the cargo flights (Fed Ex, UPS etc) since there is a curfiew at Trudeau airport. Also Bombardier has a couple of factories there. There is also a facility that does the heavy maintenance on the Air Force's F-18s. A new aircraft factory was also built there last year that is going to built light aircraft for paradrops I was told. The tower and the fire station are still operating. Only the passenger terminal was closed.