While cancelling any award ticket results in a $ 90 fee, your miles will be deposited back into your account only if the flight is cancelled more than 21 days before departure. (rewardexpert.com)
• You are able to cancel award tickets for a lower fee than other airlines. (thetravelsisters.com)
If you book an award ticket, get the 10 % refund, and then later cancel the award ticket, the mileage refund will be reversed as well. (onemileatatime.boardingarea.com)