BagComply

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American Airlines vs United Airlines

Cabin and carry-on baggage limits for American Airlines and United Airlines, side by side.

⚠ These figures are awaiting manual verification against the airline's official page. Treat them as preliminary.

Both American Airlines and United Airlines allow the same longest carry-on side (56 cm).

American Airlines is more generous for personal items — up to 45 cm, versus 43 cm on United Airlines.

Check your bag

Enter your bag's dimensions to see how it fares against both airlines' carry-on limits.

optional — leave blank to skip the weight check Leave blank and we report the piece count as not checked — never as passed. Enter it only if you want it compared.

PreliminaryRules marked Preliminary have not yet been manually verified against the airline's official page. They may differ from the airline's actual policy — always confirm with the airline before you fly.

Carry-on compliance check results
Airline Verdict Fits as Margin Checked on Source

Enter your bag's size above to see which airlines accept it.

Max dimensions
56 × 36 × 23 cm
Total linear
Not published
Weight limit
Not published
Pieces
1
Max dimensions
56 × 35 × 23 cm
Total linear
Not published
Weight limit
Not published
Pieces
1

Cabin & carry-on allowances

Baggage allowances by fare tier
Allowance American Airlines United Airlines
Personal item 45 × 35 × 20 cm · Not published · Not published · 1 pc Personal item: 18 x 14 x 8 in (45 x 35 x 20 cm). Must fit under the seat in front of you. 43 × 25 × 22 cm · Not published · Not published · 1 pc including handle and wheels Must fit under the seat in front of you
Carry-on 56 × 36 × 23 cm · Not published · Not published · 1 pc Carry-on bag: 22 x 14 x 9 in (56 x 36 x 23 cm) including handles and wheels. Must fit in the airport sizer. 56 × 35 × 23 cm · Not published · Not published · 1 pc including handle and wheels

Sources

American Airlines

Carry-on baggage (opens in a new window)
Official · unverified Last checked: 2026-10-11

United Airlines

Carry-on Bags (opens in a new window)
Official · unverified Last checked: 2026-10-11

The rules behind these figures

Both sides of this comparison come from these rule pages; open one to see its source excerpt.