My husband has his appointment next week! So I'm not 100 percent , but the lady on the phone said the stamp is all he needs it's a valid way to travel.
Bc we don't have his green card *never received it* and filed i90. Plus just his extension letter and his name is spelled wrong. 🙄
So she said that would be all one needs to travel is the stamp.
Also how to you pri t your appointment letter from online?