CVG's DL Hostage: A year or two ago I bought a terrific compact CPAP, the GoodKnight 420G from Puritan Bennett. It's about half the size and weight, maybe even less than that, of my at-home CPAP. (They may have an even more compact model by now.) The mask and hose are indeed an issue, but shorter-length hoses are also easily available. Though I don't use it on planes (even for long flights such as JFK or ORD to HKG), the savings in luggage space made it a great purchase.