Originally Posted by
Lux Flyer
Not sure if Sabre lets you do this, but generally with UA’s system if you cancel out the reserved space for the checked in flights, it will automatically uncheck those coupons too. But again not positive if there are any restrictions on Sabre from cancelling space on day of travel.
Yeah, it does, but frequently I'll want to price an exchange without first releasing the existing space and (depending on the situation) I usually can't price an exchange unless the coupons are OPEN.