"it is not possible" is typical dutch speak. It does not exactly translate and you may have more wiggle room than you think. The KLM board hears this term all too often.

In my experience this past year trying out NWA, I have found they are very bad with irregular ops. I realize most passengers think they must stay at the same gate where their flight is cancelled, overwhelming the agent. I always try and get on the phone right away. The agents on the phone have uniformly been hostile, always refuse to rebook me on another carrier.

Although inflight experiences on NWA have been uniformly pleasant, I have to give them an F on irregular ops. And to use weather as a scapegoat gets very tiring.