Travel costs up in the air over Brexit, says Which?
Holidaymakers are being left in the dark over the consequences of the UK leaving the EU without an aviation deal, a consumer group has claimed.
Which? called on travel firms to do more to highlight the possible financial implications for consumers if no agreement to continue flights is reached.
It is advising customers who have booked holidays taking place after the Brexit date of March 29 next year to check cancellation and refund policies.
The single market for aviation, created in the 1990s, means there are no commercial restrictions for airlines flying within the EU.
Which? contacted the UK's five biggest travel companies to find out what they are doing to inform people about the possible impact on their holidays.
Tui, Jet2 and On the Beach "failed to provide any reassurance that any information would be communicated upfront", the consumer group reported.
It noted that Thomas Cook has amended its terms and conditions to state that it will not provide compensation or reimburse expenses if it changes the circumstances of a booking due to airspace closures.
The firm encourages customers to take out travel insurance to cover consequential losses.
Expedia told Which? it believes passengers will be entitled to compensation in the event of disruption, although it is not yet selling post-March 2019 holidays.