If you’ve never used United’s EasyCheck-in Online, be sure to check it out on your next United flight. United Mileage Plus members who haven’t ever checked in online (or haven’t used online check-in since Oct. 14, 2008) will receive 500 bonus miles for checking in online through Jan. 31, 2010. It’s just another way for the airline to entice customers to use the computer over checking in at the airport.