Husband ordered an Air 2 - the order says Air 2. The box and the invoice just say "Air" and the part number matches the invoice. Is there a definitive way of telling the difference between the two models? I understand the logic behind the box just saying "Air" these days but it's going to make it a pain to figure out which model it actually is now. EDIT: I'd say to compare the thickness of mine (Air) vs his -- but my Air is here at work with me. Wanted to make sure it gets cleared up before the end of the business day.