Can you reference any time in the past that both opposition...

Can you reference any time in the past that both opposition leader and PM have travelled in the same aircraft to a war zone?

Gillard should have known about this convention and, on that basis, should not have even offered this trip to Abbott.

But she did and then tried to get a cheap shot at Abbott. Not a good look for a PM, IMO.
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What a load of imaginary world hogwash.
If this was the case Abbott would have rejected the offer citing this convention as his reason, not citing his lack of sleep.