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All you need is passport and AP. Make photocopies of AP (photo page) and give it to Airlines if requested. While coming in at POE, fill up I94 and give the passport and photo page to INS officer. Officer will stamp all three (passport, I94 and AP) and will retain a photocopy of the AP page with stamping. That is all. No need to show EAD or 485 receipt. When they look up your receipt number/alien number everything will show up in their system