many airlines DO charge you to change an award ticket but sometimes, when it is an emergency they may not, and if the airline makes a significant schedule change on a date then you can often leverage this in your favor as well.

However, seems like you can get a ticket on a partner as said above, but with those AMEX reward points, you might even consider cashing some in for things your friends need and have them give your son gifts for it. Cash helps but then again, one isnt 'supposed' to say that's what they are getting in return.

Additionally, maybe your own friends need things you can get for them with the AMEX rewards and in turn, THEY have access to tickets or many miles or other award options available on other airlines that you could use. This makes for more choices and options for your son.

Trades of like or partial value can often be useful in some circles... It can work when done in the friends and family circle. You just have to get creative, that's all. Always keep records too.

Welcome!
MM