But capacity (number of holidays for sale)has to be largely fixed well in advance of its being sold, and in particular it cannot be reduced at shortnotice without risk of substantial losses.
Επιπλέον, ένα ταξίδι χάνει την αξία του εάν δεν πωληθεί μέχρι την ημερομηνία αναχώρησης.