That and the service that you get is FAR more professional with BA than the silly little "low-fares" airliners that dump you at some mickey-mouse airport in the middle of no-where.
I always used to laugh at the people who flew from Stanstead to Girona with Ryanair. They advertise it as Girona-Barcelona, when it is like an hour and a half drive away.....
The bus from the airport to Barcelona City Centre costs double the extra they would have paid for a BA ticket into the cities proper airport.
FE