Gatwick-St Pancras takes 45 mins by train and runs every 15 mins
St Pancras - Euston takes 10 mins to walk
Euston - Manchester Piccadilly takes 2h05 by train and runs every 20 mins
Total is 3 hours with very high frequency throughout the day. Very difficult for air to compete on point-point.
Flybe do well when there is water in the middle of a straight-line route or when billions have not been spent upgrading the train line.