Is there a penalty for skipping a flight?

Is there a penalty for skipping a flight? Ugh, tell me about it! It's the worst. Skipping flights is such a pain, you know? Like, what's the deal? I remember this one time, I was supposed to fly from Chicago to LA with a layover in Denver. I was so exhausted from work, I just... skipped the Chicago to Denver leg. Thought I could just catch the Denver to LA flight, right? Wrong! They cancelled the entire thing. My LA trip? Poof. Gone. Just like that. So frustrating! It totally ruined my plans. I had tickets to a concert, dinner reservations... everything down the drain. And the airline? Zero sympathy. Basically told me "tough luck." So, yeah, learned that lesson the hard way. Don't be like me. If you skip that first leg, the rest of your itinerary is pretty much toast. They figure you're a no-show and, bam, cancelled. It's like a domino effect of travel disappointment. And you're stuck. Now, if you skip that last leg – say, you decide to just stay in Denver, because, hey, the mountains are calling – it's usually not a big deal unless you do it a lot with the same airline. Then they might get suspicious, think you're gaming the system somehow (which, let's be honest, some people try to do!), and they might even blacklist you. So, yeah, short answer? Skipping the first leg? Big penalty. Skipping the last? Maybe not, but don't push it.