Did the 9-11 hijacked aircraft do anything like that? There are many anti-hijack precautions apart from the RAF and one hopes it is no longer easy to get a civilian aircaft so close to the target without warning.
One thing is for sure, without the RAF and the boys and girls sitting on QRA and maintaining the aircraft right now, there would be no last line of defence.
Thankyou to QRA today for helping to keep us safe so that we can all enjoy Christmas in peace.