The sale of tickets for air travel is highly regulated in the United Kingdom by the Civil Aviation Authority. Only those with an Air Travel Organisers Licence (ATOL) accordingly may sell plane tickets or package holidays that include air travel.

In Ireland, the sale of tickets for air travel is similarly regulated by the Commission for Aviation Regulation

There are two limited exceptions to this rule:
1. Airline ticketing agents (ticket providers). These are businesses that immediately issue a valid scheduled airline ticket in exchange for any payment. This exception will normally apply only to International Air Transport Association (I.A.T.A) licensed travel agents selling published fares.

2. Agents authorised to act on behalf of ATOL holders, provided that they state their agency capacity and furnish buyers specified documents under law showing that they have accepted money on behalf of a particular ATOL holder.

If you do not have an ATOL licence or do not fall into one of the above exceptions, you should not list airplane tickets or package holidays that include air travel.