Just to answer the question posed earlier about how the airlines "know" whether you are allowed a carry on, I recently flew on an airline that no longer offers "free" carry ons (small personal item only) in economy. If you paid for a carry on, there was a notation on your boarding pass "carry on approved" (or similar). Now, whether the cabin crew or ground crew "checked" that, I do not know. I did see the notation on my boarding pass (I had paid for an upgrade which included a "free" carry on. I hate the nickel and dime fees on airlines. I do warn people that the "low" fares you see advertised are not such a good deal once you add in all the "extras" that are included in other airlines base fees, depending on your needs. Now, if you need no checked bags, don't mind sitting anywhere, etc, then sure, go for it. But, I am very long legged, and sitting in a 30-31 pitch seat for more than an hour just isn't going to cut it for me. An aisle sit is somewhat doable as I can stretch a bit. But a middle or window? No way. It's painful and won't be happening in this lifetime ever again. LOL. And, Spirit airlines isn't even on my radar as a possible option. I tried pricing out their "low" fares a couple of times, but once I added in my bag (sorry, can't survive on "just" a small back pack), etc, their "low" fares were HIGHER than what was charged by the big guys. I don't understand that model at all. LOL.