Russell Craig, head of communications at Manchester Airport, said:
"We are certainly not proud about what has happened, and that is why we and the airline are doing an investigation."
"We have to get to the bottom of it," he added.
More top news
ITV Border Political Editor Peter MacMahon says we've just seen a emotional former SNP MSP appearing to concede that the Yes side has lost.
ITV Border Political Editor Peter MacMahon says it's far too early to call this referendum.
A World War Two veteran has told ITV News he has fulfilled a boyhood dream by voting for an independent Scotland.