Xantia suspension spheres in an aeroplane's hold - can they stand the pressure?

[white exec]

Nitrogen, which is non-flammable, non-toxic.
Ordinary air is 4/5 nitrogen, something we all breathe.

[Allmostfrench]

The temperature in the hold will be similar to the cabin as pets regularly travel in the hold.
I recently had some sent to Aus. from Europe via air freight for my Xantia V6 (ouch!).

[white exec]

Not all carriers do this, and refuse animal cargo for that reason.

[andy5]

Even if the hold is unheated, it's well enough insulated and it and the cargo are of sufficient thermal mass that the internal temperature isn't going to fall to the outside temperature of about minus 50 degrees.

As for the pressure, cabin and hold altitude while cruising is of the order of 8000 feet, about 750 millibars. If the spheres can cope with working pressures of several tens times atmosspheric, a difference of 0.25 bar isn't going to hurt.