Continental wins frequent-flier polls for its overall benefits, but the best-kept secret may just be its airport Presidents Clubs ($325 to $400 a year). On top of free bites, booze, and broadband, some clubs have private bathrooms with showers and ironing services.

Key markets: Cleveland, Houston, Newark

Elite miles: Silver (25,000), Gold (50,000), Platinum (75,000)

Pros: Elites get priority baggage handling and automatic upgrades (on partner Northwest too) when front-cabin seats are available. Those about to reach a new level can get early advancement upon request.

Cons: Members complain it's difficult to redeem award tickets, and promotions meant to accelerate elite status apply only to full-fare tickets. Continental has the fewest special airport security lanes among the major carriers.