"Literally the planes would not be allowed to fly" - Philippe Ruttley, EU and Aviation law specialist, Keystone Law - Jazz FM Business Breakfast
More warnings about No Deal Brexit have come from the aviation industry, with manufacturers worried about their Just In Time supply chains, and travel companies concerned over flying rights.
Downing Street says fears over planes being grounded if access to the EU is lost are unfounded, thanks to other international agreements, but there are concerns about putting that to the test.
Nick Howard asks aviation and EU lawyer Philip Ruttley from Keystone Law what's at stake in the negotiations.
First broadcast 23rd July 2018