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Over the length of leg between Guernsey and Gatwick, the Q400 is faster than the E145 (effectively the E175's little brother). So chances are the change in speed with the 175 are negligible, it's purely for Flybe to offer more seats per landing slot and thus make more money. If the jet is indeed quicker, it's in FLybe's interests to keep the same published flight time as it gives them more leeway with late departures etc.