Clarkson also defended the claim, saying his own children "didn't fly till they were old enough to behave".
The gaffe is the latest in a long history of controversial opinions. He recently joked about ex-BBC football commentator Stuart Hall's confession to indecently assaulting young girls. He also described former British Prime Minister Gordon Brown, who is blind in one eye, as a "one-eyed Scottish idiot".
When co-host Richard Hammond called Mexicans "feckless" and "lazy" in 2011, Clarkson joked that Mexico wouldn't complain about the comment as the country's UK ambassador would be asleep in front of the TV.
He also once suggested the United Nations should "start to think seriously about abolishing other languages. What's the point of Welsh, for example? All it does is provide a silly maypole around which a bunch of hotheads can get all nationalistic."