once product development is complete, a menu cycle is then decided for a given period of time. The length of the cycle will be determined by each individual airline, consideration bring given to the year and to the different foods available. these menus will be monitored carefully by each carrier. The cycle for short-haul flights must, due to the number of occasions an individual passenger might travel on those routes, change frequency and the cycle may only last for 7-14 days with, for example, four menu cycles