American Airlines is giving us a sweet holiday gift this December! They're scheduling a ton of domestic flights on planes usually reserved for international routes. We're talking their top-tier business and first-class lie-flat seats, the kind you normally have to fly to Europe or Asia to snag. Why should you care? Well, instead of battling for upgrades or shelling out big bucks for a premium international fare, you can experience the luxury of a lie-flat seat on a shorter domestic hop. Imagine flying coast-to-coast (or even shorter routes) in ultimate comfort! AwardWallet Blog has the full list of 51 routes where you can find these hidden gems this month. Think Airbus A321T, Boeing 777, or 787 aircraft, all within the US. Time to upgrade that holiday travel – or just treat yourself!