As the member "Kontact" said, Bikeflights prices are jumping with around 80% more if the girth goes more than 130"
The girth is: L+2xl+2xh, example: 54+ 2x9+ 2x29=130
Another jump of the price is also at girth=105"
So, usually for a frame with fork, I must be under 105" and for a complete bike under 130".
I do not know about other companies, because I am using Bikeflights for about 6...7 years, without any problems.