IFR special traffic management programs (STMP) are in effect during the ski season at three Colorado airports (Aspen, Eagle and Rifle) during these dates: February 15 through February 20 and March 15 through April 3. The daily STMP start/end times this year begin each day at 8 a.m. MST and end at 6 p.m. MST to help align the STMP with sunrise/sunset times, since many operators are unable to operate outside daylight hours.