RBS has said Sir Howard Davies' appointment as a director will be subject to a "short delay" due to his commitment to the Airports Commission, until its final report is published.
It had previously been expected that Davies, who is due to become the bank's chairman in September 2015, would've become a non-executive director tomorrow to coincide with the bank's Annual General Meeting.
Davies will be taking over from Sir Phillip Hampton who left to become chairman at pharmaceuticals giant GlaxoSmithKline, a post he took up in May.
The Airports Commission, which Davies leads, is tasked with deciding between three options to increase the capacity of airports in the South East - either build a new runway at Gatwick, build a new runway at Heathrow, or extend one of the existing ones at Heathrow.
The project has been beset with delays - the latest of which came in June after a group of residents in Teddington (underneath Heathrow's flight path) applied for a Judicial Review of the Commission's work.