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Low cost carrier to base 40 planes at Heathrow? One of the most expensive airports in Europe to operate from. Er, I think not. Not unless they were to have a complete change of business strategy. Heathrow to entice easyJet (or any other LCC for that matter) with cheap landing fees? Imagine the howls of protest from all the established airlines there. No, not going to happen.
Whilst slots are constrained and indeed some early morning slots trade for tens of millions at the moment Heathrow is not actually that expensive in airline charges and other operational fees to be fair.
Oh and I think you need to talk with Carolyn McCall directly because it is Easyjets publicly stated intent to have a 40 + fleet operating out of Heathrow if R3 and T6 become a reality.
Easyjet aren't averse to operating from major hub airports today , Madrid, Amsterdam both Paris Airports. Rome FCO, Geneva, Munich to mention a few see multiple daily orange waves.
As for their business model they very much offer business travel opportunities today
Simply you are wrong.