Booking flights from Cardiff Airport could become cheaper if the Welsh Government gets the powers to set Air Passenger Duty.
The amount of tax paid on flights (APD) for Welsh customers is currently set by the UK Government, while Scotland and Northern Ireland are able to cut the cost of longer haul flights by reducing APD.
First Minister Carwyn Jones is calling on the UK Government to give Wales control over flight tax.
The Welsh Government has long called for the devolution of APD. However, the UK Government has resisted calls, saying any reduction in APD in Wales would negatively impact on Bristol Airport.
In response, a UK Government spokesperson said:
The Welsh Government says Devolving and then reducing APD in Wales would directly result in a significant positive benefit for the economies of both south Wales and the south west of England and would result in more choice for passengers throughout both regions.