Originally Posted by
drsmithy
What happens if your original itinerary has <24hr transits through LHR, then at a later date (after having already paid and done some travelling) you reschedule flights such that the transits become stopovers ?
You must pay the extra tax.
In one case about 18 months ago with a similar situation an AA rep had to come on the plane and find me to ask me to pay the tax. The check-in agent didn't catch it.