I'm sure you know the boilerplate deal by now: for the first nine months, the man is off the hook while the woman hauls the baby around. In exchange for this--and for pushing the kid out or having her bikini line slashed open--the man agrees to carry the carseats through the airports for life. [Like tips for the doorman at Christmas, the push present is still technically optional--just highly recommended, especially in neighborhoods with a lot of doormen.]
So it should be no surprise that a solution for easing the airport carseat burden would be invented by a dad. Thus, the Tote A Tot, a dad-invented harness that binds your carseat to your wheelie luggage, enabling you to wheelie them both around with ease--and with or without the kid inside [inside the carseat, not the suitcase, right? just checking.]
There are other, similar products out there, of course: the GoGoKidz wheelie cart, for example, which turns the car seat itself into a wheelie-d device. But given the different permutations of suitcases, bags, strollers, and car seats that people travel with, the Tote A Tot offers a welcome option.
Personally, as the last person on earth who doesn't have a wheelie suitcase--save your email, I know I'm a freak, but it's a matter of principle by now, like never seeing Phantom--I will have no need for a Tote A Tot. Also, we usually check every single piece of luggage we can and travel only with kid-related carry-ons, but that's just us. If you operate out of wheelies, and your suitcase handle can handle it, here, have a Tote A Tot. 25 bucks.