Originally Posted by keithguy
AA, CO, DL, CX (all AS partners too) will let you hold awards for at least two weeks, often longer. So I can hold AS A/W class for two weeks if calling AA but I can't hold AS A/W for even a day using AS.
I've never had the option to hold awards on DL. If your SkyMiles balance is less than required to ticket the award, you have the option to purchase miles to complete the reservation. Like AS, you can redeposit miles for unused award tickets.