Adding extra conditions to the sale of Aer Lingus to International Airlines Group (IAG) may not be enough to avoid a monopoly on the route.

That is according to Virgin Atlantic, which says no other airlines will be able to operate on the Dublin-Heathrow route, even if extra slots become available.

IAG - the owner of British Airways - would run all 19 daily flights from Dublin to Heathrow if Aer Lingus is sold.

Virgin Atlantic has been giving evidence at the Oireachtas Transport Committee.

And Joe Thompson, director of network and alliances at Virgin Atlantic, says it has similar experience when IAG bought another airline.

It took over the BMI, which had a big presence in Scotland, in 2012.