Originally Posted by vicarious_MR'er

...and I believe the pack and play will be considered one item of baggage against your baggage allowance, and whatever fees may apply for that would apply. You might get an agent that will send it through with a nudge and a wink as a baby item, but I think your worst case scenario is that is counts as a suitcase. It's not oversized or overweight, so you shouldn't have any nasty surprises there.