🌟 Quick overview

Carry-on rules for domestic flights in the USA are set by individual airlines within the bounds of Transportation Security Administration (TSA) screening standards. Most carriers allow one carry-on bag plus a personal item, but size allowances, overhead bin access, and restrictions on specific items differ by airline and fare class.

📐 Typical size and weight limits

🔒 TSA screening and prohibited items

TSA sets the security standards for items allowed through checkpoints. Key points include:

• Liquids must follow the 3-1-1 rule: containers 3.4 oz (100 ml) or smaller, in a single clear quart-size bag.
• Sharp objects, certain tools, and flammable materials are restricted; review the TSA list for details.
• Medications, baby food, and medical devices are permitted but should be declared at screening if exceeding standard limits.

Official reference: TSA — What Can I Bring?

🛫 Airline variations and fare-class differences

Carry-on privileges can vary by ticket type. Examples:

• Basic Economy: Some carriers limit carry-on access for basic economy fares or restrict overhead bin use; a personal item may still be allowed.
• Main Cabin / Standard fares: Typically include carry-on and personal item.
• Premium / Elite status: Priority boarding and larger allowances for overhead bin space are common benefits.

Always confirm the specific carry-on policy for your fare on the airline’s site before you travel.

🧳 Packing smart for carry-on success

• Place essentials and valuables in your personal item (laptop, documents, medication).
• Use packing cubes to compress clothing and organize items efficiently.
• Keep liquids accessible and consolidated in a clear bag for faster screening.
• If traveling with bulky outerwear, wear it through security to save space in carry-on luggage.

Strategy: Arrive at the gate early if overhead space is limited. If the bin fills, gate agents may request that larger bags be checked at the gate—plan accordingly.

🛰️ Special items and exceptions

Certain items have special handling rules:

• Musical instruments: Small instruments may fit in overhead bins; larger instruments often require a purchased seat or gate-checking policy review.
• Sporting equipment: Rules vary—some items must be checked; others are allowed as carry-on if they meet size limits.
• Battery-powered mobility aids and spare lithium batteries: Follow airline and TSA guidance for safe transport.

Check airline policies and the FAA/TSA guidance for items such as e-bikes, hoverboards, and specialty batteries.

🔗 Useful airline and agency links

• TSA (Transportation Security Administration)
• U.S. DOT — Air Consumer Protection
• American Airlines — Baggage
• Delta Air Lines — Baggage
• United Airlines — Baggage
• Southwest Airlines — Baggage

🧾 Final checklist before you fly

• Verify carry-on dimensions and any weight limits with your carrier.
• Pack liquids according to the 3-1-1 rule and declare medical items as needed.
• Arrive early to secure overhead space and complete screening without rush.
• Use airline apps for boarding updates and gate information.