Last time when I went back to Canada I took My new 1-797 approval notice since my old I-94 was expired while I was coming back INS stamped my passport and wrote H1B and valid date till 2004 also tear the bottom part of my I-797 (I-94 portion) and stapled in to my passport. Now I am going to overseas for 2 week vacation, should I give I-94 from the passport to the airline staff or should I keep it. pls advice.