I just checked a reservation I have with KLM. One of my flights has changed from a 14.30 dep. to 12.30 dep. Adding two hours onto an already long itinerary.

I was not notified by e-mail. Last year a similiar thing happened with a Delta reservation, although the dep. time only changed by 10min and they contacted me to let me know.

I find this particularly annoying because I payed extra to leave as late as a i possibly could. Grrrr....