If you’ve ever tried to book a flight within the United States, you know how confusing baggage rules can be. Each airline has its own policies for carry-ons, checked luggage, fees, and weight limits. To help you plan your next trip, we’ve broken down the essentials so you can pack smart and avoid surprise charges at the airport.

United’s Premium Plus fills the gap between cramped Economy and pricey Polaris Business Class. With more space, priority perks, better meals, and fewer hidden fees, it’s a smart middle-ground option for international or long-haul domestic travel.