Apologies if this has already been covered. My search didn't bring up my particular situation so I started a new topic.
My situation is this:
I am an Australian citizen spouse of a US citizen. My application to have conditions removed my Green Card (I-751) was received by USCIS in Feb 2019. I still have not had my interview scheduled. After my GC expired, I received my I-797 notice of action letter. After that expired,I had an I-551 stamp in my passport done at the Minneapolis St Paul field office. I've had the stamp renewed each year.
The field officer told me that this stamp would allow me to return to the USA as proof of my LPR status while I wait for my interview.
I'm currently in New Zealand and planning to return home to the USA next week. I've been away from home for a total of just over 3 months. My passport stamp is current until 10/19/2023. I've just learned that this may not be sufficient to travel. The airline may deny boarding at the port of departure (New Zealand). I've contacted an immigration lawyer in MN, USA who told me to contact the Consulate in NZ, who told me to contact the airline to confirm whether or not I need further proof of my LPR status to allow me to board a flight to USA. The airline is not currently taking calls not related to a recent severe weather event.
So my question is - does anybody have any experience or knowledge of a situation like mine, whether or not I need further evidence to be able to travel to the USA, apart from what I already have (I-551 stamp in passport) and what that further evidence might be?
Please note that I'm not requesting info about the port of entry in USA, only the port of departure in NZ.
Thank you in advance for any help.