American Tourister My AT Underseater: 18 x 13 x 8 in
Underseater (personal item), hardside, 2 roller wheels, 5.5 lb empty. Exterior figures are the maker's own, wheels and handles included.
Under the seat at 3 of 13 airlines with a published limit
The table below shows the verdict at every airline, best fit first, using the same math as the live fit checker.
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Does the My AT fit? All 19 airlines
18 x 13 x 8 in against each airline's published carry-on box, largest side to largest side, sorted best fit first.
| Airline | Cabin max (in) | Verdict | Under seat |
|---|---|---|---|
| Sun Country Airlines | 24 x 16 x 11 | Cabin approved3 in to spare | No |
| Allegiant Air | 22 x 16 x 10 | Cabin approved2 in to spare | Yes |
| British Airways | 22 x 18 x 10 | Cabin approved2 in to spare | No |
| Frontier Airlines | 24 x 16 x 10 | Cabin approved2 in to spare | Yes |
| Southwest Airlines | 24 x 16 x 10 | Cabin approved2 in to spare | not published |
| Qatar Airways | 19.69 x 14.57 x 9.84 | Cabin approved1.6 in to spare | not published |
| Lufthansa | 21.65 x 15.75 x 9.06 | Cabin approved1.1 in to spare | No |
| Turkish Airlines | 21.65 x 15.75 x 9.06 | Cabin approved1.1 in to spare | No |
| Air Canada | 21.5 x 15.5 x 9 | Cabin approved1 in to spare | No |
| Alaska Airlines | 22 x 14 x 9 | Cabin approved1 in to spare | not published |
| American Airlines | 22 x 14 x 9 | Cabin approved1 in to spare | Yes |
| Avelo Airlines | 22 x 14 x 9 | Cabin approved1 in to spare | No |
| Delta Air Lines | 22 x 14 x 9 | Cabin approved1 in to spare | not published |
| Hawaiian Airlines | 22 x 14 x 9 | Cabin approved1 in to spare | not published |
| JetBlue Airways | 22 x 14 x 9 | Cabin approved1 in to spare | No |
| United Airlines | 22 x 14 x 9 | Cabin approved1 in to spare | No |
| Air France | 21.7 x 13.8 x 9.9 | Cabin approved0.8 in to spare | No |
| Emirates | 21.65 x 14.96 x 8.66 | Tight squeeze0.7 in to spare | not published |
| Ryanair | 21.65 x 15.75 x 7.87 | Gate check0.1 in over | No |
Bag spec source: shop.americantourister.com · accessed 2026-07-09. Airline limits come from each carrier's official baggage page; open an airline above for its citations. Policies change, so verify a borderline case before you fly.
American Tourister's official US product pages (shop.americantourister.com) publish two spec-table fields in inches: External Dimensions, which the page's own tooltip defines as the total case size including handles and wheels, and Internal Dimensions, defined as packing space without handles or wheels, always listed in Height x Length x Width order with Height as the largest number. Many current PDPs on the site name sizes only by category (Carry-On, Medium, Large, Underseater) rather than printing a nominal inch number. Some retailer listings for this brand separately publish Body Dimensions (shell only, matching the nominal inch name) alongside Overall Dimensions (with wheels), and the gap between the two can be several inches, for example a nominal 28 inch Wavebreaker body is 28.0 in tall but its overall exterior with wheels is 31.0 in tall.
All 14 American Tourister bags
