I understand the KLM code has not been working at MCO recently. I have tried it a few times with no luck. I decided to try it tonight and it worked for my October rental.
Glad I read this. I was able to nab a $345 rate for 6 days for a Mustang convertible at the Oakland, CA airport in November. These rates were about $140+ per day. It only cost me $40 more than the compact I had reserved with Dollar.