GCILover - The scheduled times are gate to gate not landing and take-off. Don't know the reason for SOU 55min timings but for LGW at peak times (which is for much of the day) you can expect to queue for at least 15 mins at the runway holding point before take-off. Add this to the pushback and taxi time and it could be 30mins plus from pushback to airborne. Arrivals are often slot constrained at origin which could mean 10 - 15 min delay leaving GCI to LGW. Add on a few times around the holding stack before being vectored in sequence for landing and the gate to gate time adds up. Of course the times will differ slightly depending on if it's an ATR or the E190 doing the flight. One of the down sides I'm afraid of maximising capacity on the busiest single runway airport in the world.