Flying with BA - contacted them and they had no clue what I was talking about. They require an expiry date for advanced passenger info. My greencard is expired but my I-797 states I have an additional 18 months from that date. I presume I enter the latter? Anyone experienced this ?
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source https://www.reddit.com/r/immigration/comments/ou2y3l/i797_travel_what_exp_to_write_for_advanced/