From: PDX (and now) London, UK
Invest in the Tabby. It's worth it.
Tabby is IJNAF only. And transport flying boats are much superior.
Tabby is 2E, thus much cheaper and easy to manage than a 4E Emily in game if you're not flying from big bases with lots of support. Anything inland also needs something with wheels.
I love the Emilys. They've saved quite a few stranded units, but the Tabby is sturdy, flies a full group every day and carries a good load a long way (up to 17 hexes between your own bases). Make what you want, but I certainly am happy I set up one 30 sized research factory for this, got it a few months ahead, and have both of these types flying.
"Success is the ability to go from one failure to another with no loss of enthusiasm." - Winston Churchill