<h1>Airspace restrictions and enhanced security measures may disrupt flight schedules and airport processing; passengers should allow extra time.</h1> Enhanced security measures and changing airspace restrictions have caused flight cancellations, altered schedules and longer security checkpoint processing times at the national capital's primary international airport. Airport management advises passengers to allow extra time for security screening and to cooperate with airline and security personnel to facilitate movement while temporary airspace and security protocols remain in effect.