Complex sentence: Although regular scheduled flights from the airport have operated, some have never been viable commercially leading to a series of failed operations.in 1967 Autair started a service to London, using Luton at first, then Heathrow.
Split into simpler sentences: Although regular scheduled flights from the airport have operated, some have never been viable commercially leading to a series of failed operations. In 1967 Autair started a service to London, using Luton at first, then Heathrow.