I've started flying them regularly and upgrading to first class for around $ 100 extra each way. (milevalue.com)
You may also be able to use your miles to pay for other travel expenses and get access to various benefits like buddy passes and complimentary upgrades to first class. (smartasset.com)
In my last financial travel tip about traveling in style for free, I talked about scoring a free upgrade to a first class flight — just by asking for it. (theprofessionalhobo.com)