I am on a once in a lifetime trip with my never-had-a-passport-before dad to Scotland this August , and I was able to book LHR-IAD in United first, then IAD-MCO (our destination) in United economy, not being able to get business class for that flight due to scheduling contraints. I just recently found availability to change this flight to a same day LHR-FRA-MCO in Lufthansa business. I want my well deserving dad to have an incredible experience on this trip, including on the flight back, and while first class would be neat I almost feel like changing this to Lufthansa business class and experiencing their business lounge in Germany would be even cooler than a 7 hr United first class flight... Would the fees I would pay to change this award ticket down to business class (but on Lufthansa) be worth it in your opinion as far as giving my dad an overall better experience? Also, do you know what the change fee is? $150 a passenger or something?