Had no clue about this policy with Delta. The fine print isn’t exactly clear, so I’m guessing your miles may vary depending on your gate agent and airport. I am going to have to investigate the other airlines (somehow I’m guessing they aren’t as generous). Of course – don’t forget Southwest’s 2 free bags that make this all a non-issue if you choose to fly Southwest.
Even those who embraced the playpen, however, did so somewhat reluctantly (“a necessary evil,” ran one headline), and when I reached for the parenting bookshelf, it seemed the anti-playpen voices began to dominate. In Your Baby and Child by Penelope Leach, I was told that “babies who spend hours confined in cribs or playpens, with few toys and minimal adult attention, are very slow in learning to reach out and get hold of things and that means they are also slow in discovering what can be done with things.” In a book called Smart-Wiring Your Baby’s Brain, we are advised to “minimize the time she is confined to a crib or a playpen during waking hours.” Mavis Klein, in The Psychodynamic Counseling Primer, writes that “it has actually been shown that children of about seven or eight years of age who were, as infants, regularly confined in playpens, are less competent at reading and writing than those who were not so imprisoned”; while John Rosemond’s New Parent Power! warns that “there is evidence suggesting that children who spend lots of time confined in cribs or playpens suffered delayed speed and are less coordinated.”
Fisher-Price Ocean Wonders Aquarium Playard - This is the benchmark for comparison. When I had my first child, he was only in our house so this served as his napper and playard in the family room when we didn't want to trek to the bedroom. My first loved it. Napped easily in the bassinet, changed his diapers in the bassinet, easy to clean, set up, take apart, and the mobile was awesome - ran on batteries and had good songs. This was THE ultimate playard. In fact, we brought this back out ... full review

The Fisher-Price Ultra-Lite Day & Night Play Yard gets the vote for the most portable playpen. Weighing in at just 15 pounds, it is half the weight of some other playpen models. This playpen comes loaded with extras: an inclined sleeper/bassinet for infants, as well as a changing station and pocket to store diapers and wipes. The fabric on the changer is machine washable, making it easy and convenient to clean. This product is easy to assemble and fold up for storage or travel. At around $80, this product is firmly in the mid-range of prices for playpens. Some consumers do not like that the bottom of the playpen sits on the ground and that the mattress for the playpen is very thin and flimsy. Because the bottom is low to the ground, it can be difficult for some caregivers to lay their baby in the bottom portion for naps.

Most manufacturers make play yards that are designed to move. Many roll on wheels and fold easily and compactly into their own totes, which resemble short golf bags (although less rugged), making them ideal for trips or jaunts to Grandma's. As we've said, basic play yards tend to be smaller (about 28 inches wide) and lighter (about 20 pounds) because they're not loaded with extras. If you can find a model that fits into its travel bag with its wheels exposed, it can make moving through a busy place such as an airport easier. The Chicco Lullaby LX mentioned above does that.
The quality is certainly there. The mesh seems very strong and its very easy to collapse and put away. The same goes for putting it together. It just folds in or out. The reason for not giving it 4 stars is the padding on the floor. We had to put additional patting as its too hard. So keep that in mind when buying this play pen. I would recommend for its portability and the zipper at front.
It's helped us out tremendously. It provides a way for us to cordon off a safe space for our son while allowing him an area to freely move. The fact that it breaks apart and can be arranged in various patterns allowed us to expand that space with some creative use of furniture. Sadly though like all young raptors, he's testing the gates, looking for weaknesses that he'll eventually use to escape and terrorize the local populace of cats.
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