Take context from the input text and decide on the accurate relationship between 'Heathrow hub' and 'London' from the options provided.
Options: distributed by, headquarters location, founded by, publisher

A clue to BA's lingering love affair with the 747 lies in the model's ability to eke out capacity from scarce operating slots at its London Heathrow hub at a time when lower fuel prices make retaining older planes an option.
headquarters location