To really save fuel, don’t fly at all. Think of how many business people fly to meet face to face. With all the available technology for remote conferencing, it’s amazing how few businesses take advantage of it. Perhaps someday in the future we’ll ‘plug in’ to an avatar half way around the world and be wherever we need to be instantly.
I now work at an aerospace company, and I have to say that they are pretty good at cutting excess travel (air and ground) and providing for virtual meetings. The old wireless/telecom company I used to work for has people travelling ridiculous amounts. The airplane maker discourages inefficient plane travel and the phone company encourages it.