I do agree that airlines should have more aircraft. If daily flight are packed then holidays are going to be a nightmare. I know there is extra costs to additional aircraft but the current “just in time plane” strategy is stupid.
How are airlines going to justify new airplanes when the current passenger load factor is less than 80 percent? Do you think the public will want to pay even higher airfares just so there are more aircraft flying around with even more empty seats? Not to mention the added airspace congestion and increased workload on ATC. I'm guessing you don't work in the airline industry.