You will not be able to pay two mortgages.
There is a 100% certainty you will have to/ want to move for a flying job.
You won’t be able to sell when want to and besides with closing costs and all you won’t have any equity first couple years.
There’s your answer.

I’m honestly surprised you couldn’t come up with that yourself. No offense, have you thought any of this through?
Is does not sound like it.