A shuttle transfers passengers from 5:30 to 22:30, on a route between an airport and 3 hotels. The shuttle departs the airport every hour on the hour and drops off passengers at the hotels always in the same order (airport->Sheraton->Hilton->Carlson) and with fixed travel times between station pairs:
Airport - Sheraton : 21 min Sheraton - Hilton : 5 min Hilton - Carlson : 4 min Carlson - Airport : 30 min
On Wednesday Eddie got on a shuttle from his hotel to the airport exactly 2 hours before his flight. To Eddie’s surprise, the ride to the airport took 8 minutes less than it took on the previous Thursday when he stayed at that same hotel and had to catch a 13:30 flight.
What time was Eddie’s flight on Wednesday?
Note that the "same order" of stations refers only to dropping off passengers at the hotels.