航空公司规定

Security decides what you can bring; your airline decides how big the bag can be. Dimensions below include wheels and handles.

Airline	Carry-on size	Weight limit	Carry-on fee
🇺🇸 Delta Air Lines	22 × 14 × 9 in 56 × 35 × 23 cm	No published weight limit	Free	Rules →
🇺🇸 United Airlines	22 × 14 × 9 in 56 × 35 × 23 cm	No published weight limit	Depends on fare	Rules →
🇺🇸 American Airlines	22 × 14 × 9 in 56 × 36 × 23 cm	No published weight limit	Free	Rules →
🇺🇸 Southwest Airlines	24 × 16 × 10 in 61 × 41 × 25 cm	No published weight limit	Free	Rules →
🇺🇸 JetBlue Airways	22 × 14 × 9 in 56 × 36 × 23 cm	No published weight limit	Free	Rules →
🇺🇸 Alaska Airlines	22 × 14 × 9 in 56 × 36 × 23 cm	No published weight limit	Free	Rules →
🇺🇸 Spirit Airlines Ceased 2026	22 × 18 × 10 in 56 × 46 × 25 cm	No published weight limit	Paid add-on	Rules →
🇺🇸 Frontier Airlines	24 × 16 × 10 in 61 × 41 × 25 cm	35 lb (15.9 kg)	Paid add-on	Rules →
🇺🇸 Hawaiian Airlines	22 × 14 × 9 in 56 × 36 × 23 cm	25 lb (11 kg) legacy limit — confirming post-merger harmonization	Free	Rules →
🇺🇸 Allegiant Air	22 × 16 × 10 in 56 × 41 × 25 cm	No published weight limit	Paid add-on	Rules →
🇺🇸 Sun Country Airlines	24 × 16 × 11 in 61 × 41 × 28 cm	35 lb (15 kg)	Paid add-on	Rules →
🇨🇦 Air Canada	21.5 × 15.5 × 9 in 55 × 40 × 23 cm	No weight limit — you must lift it into the bin unaided	Depends on fare	Rules →
🇨🇦 WestJet	22 × 14 × 9 in 56 × 36 × 23 cm	No published weight limit — must fit the sizer	Depends on fare	Rules →
🇨🇦 Porter Airlines	21.5 × 15.5 × 9 in 55 × 40 × 23 cm	Must fit the airport sizer — no universal weight limit published	Depends on fare	Rules →
🇨🇦 Flair Airlines	21.5 × 15.5 × 9 in 55 × 40 × 23 cm	Carry-on 10 kg (22 lb); personal item 7 kg (15.5 lb)	Paid add-on	Rules →
🇲🇽 Aeromexico	21.5 × 15.7 × 10 in 55 × 40 × 25 cm	22 lb (10 kg) combined cabin allowance on basic fares	Free	Rules →
🇲🇽 Volaris	22 × 16 × 10 in 56 × 41 × 25 cm	Carry-on 10 kg (22 lb); combined cabin caps vary by fare — verify at booking	Depends on fare	Rules →