Around about the time of the change in operators last year (from Norse to Konect Bus), the 501 Park & Ride was re-routed to swing through the airport at the end of its outbound journey to the Airport P&R. You can now catch a bus from the terminal every 15 - 30 minutes on a weekday. Inbound towards the city you'll spend a few minutes waiting at the P&R site before the bus runs express to Anglia Square, Tombland, Castle Meadow then on to Thickthorn.