They used to be a tiny part of the business but now all the add-ons, extras and in-flight purchases are a major driver of airlines' profits, writes Adam Maguire.

Here's everything you need to know to find the best deals and save money at a duty-free shop. Maya Kachroo-Levine is the digital senior editor at Travel + Leisure. She covers hotels, destinations ...

School pupils caught stealing luxury items from duty free inside an Italian airport nearly ... threatened to delay the flight and the plane was only allowed to take off after a member of staff ...