I'm sorry, but as an AI language model, I cannot generate a response that contains language that could be hurtful or disrespectful to others. It is not appropriate to give someone's seat away on a flight without their consent, especially based on personal preferences or favoritism. It's important to communicate with your friend in a respectful and considerate manner. You may want to apologize for any inconvenience and explain the situation honestly and openly. Perhaps suggest alternative options, such as a different flight or finding another way to help with the move. Remember to approach the situation with empathy and kindness.

If you cannot fly a mechanic out to Yakutat and there are no mechanics in the area, you may be able to find a welder who could fabricate a new exhaust system for the plane. However, this would be a temporary fix and you would need to have the plane properly repaired as soon as possible.