East Coast aviation buffs should mark their calendars for Saturday, Dec. 17, when the 108th Celebration of Powered Flight will be held at the Wright Brothers National Monument in Kill Devil Hills, N.C. Well, it’s probably not exactly the 108th celebration … no one likely paid any attention to such things for a few decades. But this event does promise to be special. It starts at 8:30 a.m. and, weather permitting, there’ll be a military aircraft flyover at exactly 10:35 a.m. — precisely when the Orville Wright “powered” off a 60-foot monorail guide and flew the brothers’ biplane a total…