Even the holds of cargo planes have to be temperature and pressure controlled or else the contents would be damaged. I was concerned about this very thing and asked a shipper one time, and they said yes they had to, or else things like aerosol containers would burst and make a big mess. Remember, up there at 35,000 feet or so, the outside air temp is well below freezing and the air pressure is almost nil.
I'm not familiar with pictorico type film -- is it an odd size or something? For my negs, I just buy the archival preservers -- pages that are available in sizes from 35mm to 8x10 -- from my local camera shop.