Steve, I realise this is an old thread but did you end up borrowing any of the bike bags offered? Im in the same position in that I have to travel interstate for 3 weeks of work and cant bear the thought of not riding for the duration.
Mate, we took ours to Tassie in two cartons from LBS, even came complete with padding from the new bikes they'd just taken out of them. Two bikes delivered on four different flights, perfectly safe. Will be doing the same next time. Carton was big enough to even fit in front wheel in wheel bag, track pump, various tools, helmets, shoes....
I don't use bike bags cos they throw em around like other bags. Bike boxes are free and WAY better for safety. Ive travelled around the globe on about 15 flights a year average in the last decade and only ever broke a RD hanger. Thats it. Cost me 20$ to replace.