This choice results from the balance that must be achieved between what the clientele asks for regarding flights, and what the airline companies can do. I don't know whether anyone has ever spoken to you about double rotation. That concept allows an airline company to use an aircraft to do the same route twice, in four segments, and thus serve a particular destination at a reasonable price, particularly sun destinations. This means that the aircraft has to fly as long as possible given the time it takes to prepare these double rotations in the winter, which probably includes two de-icings. So the point is to balance what the population is asking for, what the passenger is asking for, what the airline companies want, and, of course, what our weather permits, generally speaking.
On October 30th, 2018. See this statement in context.