Aviation consultancy MSP Solutions has proposed to the UK's Airports Commission that Bristol and Cardiff airports be demolished and replaced with a new hub in the Severn Estuary.
The envisioned facility would serve Wales and the southwest of England, and entail an eight- to 10-year construction project costing around £5 billion ($7.7 billion).
Comprising a single 4,000m runway and a terminal building on the north bank of the estuary, the airport would have an initial capacity of 20 million passengers per annum. Expansion could increase this to 30-40 million.
MSP argues that the new airport would have the critical volume of traffic required to attract medium and long-haul services.
The consultancy highlights benefits arising from a location accessible to the M4 motorway and railway services linking London and south Wales.