First off... it's spelled PLANE, not plan. Secondly... I highly doubt you have never ever made a mistake or forgotten anything important in your life. I can see how he could have left it... his mistake was putting it in the pocket to begin with. When you have bunch of things going through your mind and your tired, it's easy to overlook something. That is why when I'm leaving a plane, I'm usually the last one off. I don't want to feel rushed and forget something.
I really also don't understand why a person can left out all the 'e' after 'plan' in a post. come on..!
it must be my iPad auto correct feature
To the OP... I hope you get your iPad back dude. You best bet is to Call the Airline's Lost and Found.
Goodluck..