If you travel on airplanes often, it can pay to have a frequent
flyer -- or "air miles" -- account with the airlines on which
you fly on a regular basis. On top of giving you access to
online check-in and other special privileges, you also have the
option of redeeming your miles for flights once you've racked up
enough miles. While the process is pretty straightforward,
perhaps the most challenging part of this process is keeping
track of your air miles accounts, so you know when you're
eligible to book a flight using your miles.  Step 1  Retrieve
your air miles or frequent flyer number from your files and have
it on hand. If you're not sure or you can't find it, call the
airline's customer service telephone number and inquire about
your number.  Step 2  Navigate to the Frequent Flyer or Air
Miles website for the airline with which you have an account.
Log in with your air miles/frequent flyer member number and a
password, if applicable. Once you're logged in, view the number
of miles you've accrued on your a