a) Does Warsaw even need a second airport?
Modlin will be dedicated to low cost airlines, as a frequent flyer when spending my own money I select on price, so in my opinion competition is good for the consumer.
b) In what way is it a leg up?
Modlin should assist in bringing down prices for travelers, provide more low cost routes, as well as taking some traffic away from Okęcie.
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c) Real second airports are places such as Gatwick.
I could not even begin to compare Warsaw to London.
Maybe Manchester or Birmingham in size of population.