Orion, thanks for adding a tanker to the mission. Carrier landing is tough, but trying to air to air refuel in FSX is extremely challenging.
I had a question which might help everyone here who seems to want a different type of tanker in the air. Can we modify the aircraft ourself once we download your multiplayer mission files? Is it an easy change to the code, or folder for which the mission looks up for the tanker aircraft? So if the mission file wants to load the default 737, can we put an F/a-18 or S-3, or whatever we want and call it the default 737 in that file so it displays that aircraft in the mission? Just a thought. I know you can't please everyone, but if you gave us some insight on how to do this (load the aircaft of our choice) or just let us know this is impossible that would be great.
Thanks for all the hard work and looking forward to flying the multiplayer mission! 
My pleasure
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In a word, no. There are several reasons for this. I'll list them out below, starting with the most important.
1. Incompatibility. FSX will throw an error at you if your mission files are different from the host's files and won't allow you to join the session.
2. Other variables. Without going into too much detail, there are other parts of the mission that depend on the tanker, so those would have to be changed as well.
3. Hard to edit. Unless you have the Object Placement Tool from the FSX SDK and a tool to decompile a mission SPB (Sim-Prop Binary) file, you'll have a hard time to edit it. Even if you do manage to, there'll be incompatibility issues with other players (see point one).
4. Editing the aircraft itself. If you do edit the aircraft.cfg to trick FSX into thinking your aircraft is the 737, it won't work because there are other variables in the mission that are dependant on the 737 (see point two).
