The restriction prohibits all aircraft operations, including commercial, cargo and general aviation flights, from 11:30 p.m. MST on Feb. 10 through 11:30 p.m. MST on Feb. 20. The restriction was issued for “special security reasons”, according to an FAA notice, a move that is rare for an airport in a major U.S. city.

…The FAA notice does not explain why the closure order was issued…