It’s no secret that most air carriers in the U.S. have been struggling lately.

Now, most of the major American airlines are cutting way back on flights, grounding dozens of planes each in an attempt to slash costs.

So which routes are most affected, and which cities have seen their departure and arrival numbers slump?

As Peter tells Matt Lauer, you might just be surprised …

Check out more of Peter’s Today show segments.

Or watch more helpful travel videos.

Learn more about on our nation’s struggling air system with our Airlines & Airports section.