I think he'll do well with my cats. They have visited dogs and have been visited by dogs for a few hours to a week and they end up playing. I plan on bringing my pup over to friends' to visit early so I can socialize him early.
The professional working dog obedience training is definitely by positive reinforcement. The classes are one on one, not group, and use food and rewards for training. Seeing as all the traininers there are certified and train dogs for narcotics, bomb detecting and police work, I expect great results.
If possible, I would rather drive and bond with the dog in the car (my wife will drive back) than in the plane - where I can't take him out to go potty or hold him or be on the same level or control the atmosphere as much. If I can not drive, then I will fly with the basenji in the cabin, but I'll never have one shipped in a crate under the plane.