If you travel with a Blackberry, iPhone or other web-enabled phone, many airports and airlines are now accepting electronic boarding passes in lieu of paper ones. In addition to the green benefit of not using paper, the digital boarding passes are convenient for those traveling with just a phone and without access to a printer. If your airline and airport offer it, you should see the option on the screen when you check in online. To learn more, read this overview from the TSA.
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Feldman, Barbara. "Go Green With Electronic Boarding Passes." Surfnetkids. Feldman Publishing. 6 Apr. 2010. Web. 29 Nov. 2014. <http://www.surfnetkids.com/tech/516/go-green-with-electronic-boarding-passes/ >.