 No refunds were given on such tickets, and on one occasion the Burbank police responded to calls from a nearby airfield where an angry crowd of passengers were demanding access to an overbooked flight.Some of the nocturnal nonscheduled carriers attempted to evade landing fees at their destinations by covertly slipping in and out of airports in the middle of the night.However, with the founding of the Aircoach Transportation Association, the trade association and lobbying group of the non-scheduled airlines, stricter policies of etiquette, safety, and consumer protection became standard across the industry.