My friend left US early this year. He couldn't find his airplane ticket and the boarding card. He took Air China back to China. Does Air China keep passengers's information? How can my friend get some kind of evidence from Air China? Does anyone have the experience?
One of my friends told me that INS knows when my friend left US even though he forgot to return his I-94. The reason is my friend's passport/visa was scanned when he left US from the airport. I didn't remember my passport/visa was scanned when I left for China last year. Does anyone know this? Thanks for help.