Originally Posted by
drewaz
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3. I've heard there is a tax charged passengers flying into London ... we will be initially flying to Paris but possible returning home from London ... if there is a tax, does it apply to people departing London (example: Fly to Paris but get an open jaw ticket and return to the US from LHR)?
The UK APD applies to departures only from most UK airports, including LHR. APD does not apply to arrivals or transits.
For business class it is a noticeable sum of money.
https://en.wikipedia.org/wiki/Air_Passenger_Duty