Need to meet all the conditions not just 24 hour window.

Always best to check for options multiple ways -- the mobile app will many times have different options from the online site. The Change Flights option from the itin page may have different options from the Checkin page.

So if you don't see what you want, try the other approaches


More about "incorrect" fee in http://www.flyertalk.com/forum/unite...-wikipost.html