I just went online to check something on our reservation and randomly decided to go to online check-in....ok it wasn't that random, I wanted to check if I had added a credit card. Anyway-I saw this: Bring These with You! 1. Your signed and completed Online Check-In Signature Form (Reprint Signature Form) 2. All other required (and optional) forms, signed and completed 3. Valid proof of citizenship for all members of your party, including children 4. Valid government-issued photo identification for all adults in your party 1-I have that....good to go 2. WHAT??????? I checked out the optional forms and don't need those, but what other forms am I missing?!?!?!?!?!?!?! 3/4 passport works for both of these right?? I'm really confused about these extra forms.