What’s changed? Since 1 March 2016, children aged 12-15 no longer pay Air Passenger Duty (APD) when travelling in economy. This encompasses all British Airways flights departing from a UK airport. Some affected customers may have been charged the adult APD and be eligible for a refund.
If you are eligible, you must take action at least 72 hours before you travel to qualify.
2-11 year olds stopped paying the tax on flights from 1 May 2015, while children under 2 years old have never been charged APD.
http://www.britishairways.com/en-gb/information/family-travel/air-passenger-duty
