Fed Ex confirmed that the cargo hold of freight planes will reach near freezing temperatures. A non-stop Singapore/LAX flight is about 17 hours. If the cue had a higher than usual moisture content, for example being kept in a warm, humid environment, I can see where wood movement and possibly trapped moisture could play havoc on a cue.
I don't think shorter flights would experience this as much as long flights, where the contents will eventually reach these very cold temperatures. Do I have a solution? Not really. Storing a cue in a climate controlled, low humudity environment in the first place - maybe using electric hand warmers in a well insulated case when something is going to be shipped on long flights.
Chris