First Sentence Help- Off The Edge

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Hi Everyone-- I need help. I am trying to fix my MS first sentence (we all know how important that first sentence is). I'm just not getting it right. I know what I want to say, but the words aren't coming. I need your advice.

Here it is:

If I had an inkling that everything would change in less than twelve hours I would have stayed on the plane.

Any ideas?? One sentance only.

Thanks-Erin