What would be an ideal aircraft to start an airline?

if start airline, ideal aircraft start empire, bearing in mind id want money , cost effective flight, feel flights london ireland , france route start with, routes feel profitable , aircraft best take there, , from? bearing in mind cost means , must cheapest in long run!!!!!

if start airline, ideal aircraft start empire, bearing in mind id want money , cost effective flight, feel flights london ireland , france route start with, routes feel profitable , aircraft...

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