Posting wirelessly but, here's a thought
Maximum discount is $500 on $2500
Book a flight from some obscure airport maybe some Delta out post in africa or something to Vegas for $2485 + $15 hotel for total of $2,500
Pay $2000
Have flight worth $2485-$150 change $2335 or $335 profit for future travel
This used to work with similar deals don't know if will with Amex in particular
Even better any way to get refundable flights? I'd research more but won't be on computer before it's over