I'm more worried about the airplane tires. Neither heat from the pump or cooling air sounds plausible to me.
I did find this on aircraft tire maintenance. It turns out that new aircraft tires do expand, because of the properties of the tire rubber.
[h=2]Tire Inflation[/h]Due to the properties of the materials from which they are constructed, aircraft tires will expand for up to 12 hours after initial inflation. As the volume of the tire increase, the effective pressure will decrease.
Therefore the inflation pressure of newly mounted tires should be checked after a minimum of 12 hours and re-inflated to the required pressure. Consequently, tires should not be placed in service until they have been inflated a minimum of 12 hours, pressure rechecked, and tires re-inflated if necessary. Within the next 24 hours, if the pressure decreases more than five percent, it could be caused by trapped air between the tire and tube, valve-core leakage, or a damaged tube.
http://www.avweb.com/news/maint/193372-1.html
I don't think any of that applies analogously with bicycles, other than valve leakage or damaged tubes.