I just returned from a week vacation. I took my creaky old Dell Inspiron 9400 running WinXP as I have done dozens of times in the past. It worked without a problem all during the vacation. On the way home, I tried to use it during the 6-hour cross-country flight. The first time I powered it up, the touchpad was acting up. It would sorta more the cursor, but it was herky-jerky and it would get stuck on borders of windows. The buttons worked fine. I was able to navigate somewhat using the keyboard and keyboard shortcuts, but could not get the touchpad to move the cursor reliably. I rebooted the PC 4-5 times. I also checked the mouse settings and everything looked oK.
After an hour or so, I gave up and put it away.
I just got home and set it up on my desk. It is working perfectly. The only difference is that here at home it is plugged into the cable modem via a cat5 cable. On the airplane, it would have had to use the in-plane WiFi, but I never got that far. On vacation, it was also not plugged into a cable and it worked fine,
Can anyone think of what might have been going on?