Leaving the EU is unlikely to cause airfares to go up, Ryanair boss Michael O'Leary has told ITV News.
He said it was "impossible" to be certain but Mr O'Leary, who is against Britain leaving the EU, said: "I don't believe leaving the European Union will cause airfares to rise."
David Cameron has warned that Britain has "100 days to secure our future", as a poll suggests the final result hangs in the balance.
The EU referendum is a choice between "the devil and the deep blue sea", one of the UK's most senior business leaders is to say today.
Britain's car industry is an economic success story, and with uncertainty over the impact of Brexit, it wants to stay put.