Originally Posted by
Flightrider
Good question - and the answer is no. An airline could theoretically pop up and announce something new without any prior signal through the slots data, then put their schedule into the system later. It's a facilitation exercise to avoid obvious conflict (e.g. international terminal arrivals capacity etc) and also to drive the data which powers the airport FIDS systems.
easyJet was one route on Mon/Thu (EJU1291/1292) and a second route on Thu/Sun (flight numbers EJU1514-1518).
thanks for the clarification