A taxi drivers' union wants to pass airport drop-off charges on to passengers without waiting for council approval.

Aberdeen Airport introduced a £1 charge for drivers in January 2015 and doubled it to £2 in April this year.

The move was described as a safety measure by management at the airport, where the number of passengers has plunged 14% over the last year.

Aberdeen City Council agreed to let taxi drivers add the £1 charge to fares six months after it was introduced, but has yet to decide on whether or not to allow them to pass on the full £2.

The Unite union has asked councillors to change the rules to allow taxi drivers to pass any future increase on to passengers "without waiting for the council to approve it months afterwards".

Concerns have been raised over the impact of the drop-off charge on taxi firms, which are already struggling as a result of the oil slump.

Unite has also asked councillors to review the decision to allow airport taxi drivers to operate in the city.

The union claims their services are "no longer required due to the economic downturn in the city". It said there are "ample yellow plated taxis at the ranks every night".

Councillors will consider the issues at a meeting on Thursday.