FitOrNoFit

✅ Allegiant Airlines includes 1 personal item for free, up to 7 × 15 × 16 inches (18 × 38 × 40 cm).
Carry-on bags up to 9 × 14 × 22 inches (23 × 36 × 56 cm) are allowed for a fee. Wheels and handles count toward the size.

Item	Max Size (inches)	Notes
Carry-On	7 × 15 × 16	Free; must fit under seat
Personal Item	9 × 14 × 22	Extra fee; fits in overhead bin

How to Measure Your Bag

1. Measure wheels and handles too.
2. Compare with 7 × 15 × 16 personal item box.
3. For carry-on, check it’s within 9 × 14 × 22.

Gotchas / Common Issues

• Allegiant enforces personal item size strictly; oversized bags get charged.
• Carry-ons cost extra, usually cheaper if purchased online.
• On busy flights, compliant carry-ons may still be gate-checked.

Sources

Allegiant Airlines baggage policy

✅ Frontier Airlines includes only 1 personal item for free, up to 14 × 18 × 8 inches (36 × 46 × 20 cm).
Carry-on bags up to 24 × 16 × 10 inches (61 × 41 × 25 cm) are allowed for a fee. Wheels and handles count toward the size.

Item	Max Size (inches)	Notes
Carry-On	14 × 18 × 8	Free; must fit under seat
Personal Item	24 × 16 × 10	Extra fee; fits in overhead bin

How to Measure Your Bag

1. Measure including wheels and handles.
2. Check your personal item fits in 14 × 18 × 8 box.
3. If buying carry-on, confirm it’s under 24 × 16 × 10.

Gotchas / Common Issues

• Frontier is strict on personal item size; oversized bags get charged.
• Carry-on requires an extra fee (cheaper online than at the gate).
• Full flights may force gate-checks even for compliant carry-ons.

Sources

Frontier Airlines baggage policy

✅ Spirit Airlines includes only 1 personal item for free, up to 18 × 14 × 8 inches (46 × 36 × 20 cm).
Carry-on bags up to 22 × 18 × 10 inches (56 × 46 × 25 cm) are allowed for a fee. Wheels and handles count toward the size.

Item	Max Size (inches)	Notes
Carry-On	18 × 14 × 8	Free; must fit under seat
Personal Item	22 × 18 × 10	Extra fee; fits in overhead bin

How to Measure Your Bag

1. Measure wheels and handles too.
2. Compare with the 18 × 14 × 8 personal item box (strictly enforced).
3. If using a carry-on, check that it fits 22 × 18 × 10.

Gotchas / Common Issues

• Spirit is very strict: oversized personal items often get charged as carry-ons.
• Carry-ons require an extra fee (usually cheaper if purchased online).
• On full flights, even compliant carry-ons may be gate-checked.

Sources

Spirit Airlines baggage policy

✅ Yes, Alaska Airlines allows 1 carry-on up to 22 × 14 × 9 inches (56 × 36 × 23 cm), plus 1 personal item that fits under the seat.
Wheels and handles count toward the size.

Item	Max Size (inches)	Notes
Carry-On	22 × 14 × 9	Wheels/handles included
Personal Item	Must fit under seat	Backpack, purse, or laptop bag

How to Measure Your Bag

1. Measure your bag including wheels and handles.
2. Compare with the 22 × 14 × 9 inch carry-on limit.
3. Test your personal item by sliding it fully under a seat.

Gotchas / Common Issues

• Regional jets may require gate-check for compliant bags.
• Wheels and handles are included in size limits.
• Personal items must fit fully under the seat.

Sources

Alaska Airlines official carry-on baggage policy

✅ Yes, JetBlue allows 1 carry-on up to 22 × 14 × 9 inches (56 × 36 × 23 cm), plus 1 personal item that fits under the seat.
Wheels and handles count toward the size.
Note: Blue Basic fares do not include a carry-on bag, only a personal item.

Item	Max Size (inches)	Notes
Carry-On	22 × 14 × 9	Included on all fares except Blue Basic
Personal Item	Must fit under seat	Backpack, purse, or laptop bag

How to Measure Your Bag

1. Measure including wheels and handles.
2. Compare with the 22 × 14 × 9 inch carry-on rule.
3. For personal items, test if it fits fully under the seat.

Gotchas / Common Issues

• Blue Basic tickets don’t include a carry-on — only a personal item.
• Oversize personal items may be charged as carry-ons.
• Regional flights may gate-check compliant bags if bins are full.

Sources

JetBlue carry-on baggage policy

✅ Yes, Southwest Airlines allows 1 carry-on up to 24 × 16 × 10 inches (61 × 41 × 25 cm), plus 1 personal item (like a purse, backpack, or laptop bag).
Wheels and handles count toward the size.

Item	Max Size (inches)	Notes
Carry-On	24 × 16 × 10	Wheels/handles included
Personal Item	Must fit under seat	Backpack, purse, or laptop bag

How to Measure Your Bag

1. Measure your bag including wheels and handles.
2. Compare with the 24 × 16 × 10 inch limit.
3. Test your personal item by sliding it fully under a seat.

Gotchas / Common Issues

• Southwest bins are generous, but small regional planes may require gate-check.
• Personal items must fully fit under the seat, not just partly.
• Even if your bag meets size rules, space can run out on full flights.

Sources

Southwest Airlines carry-on baggage policy

✅ Yes, United Airlines allows 1 carry-on up to 22 × 14 × 9 inches (56 × 36 × 23 cm), plus 1 personal item up to 9 × 10 × 17 inches (22 × 25 × 43 cm).
Wheels and handles count toward the size.

Item	Max Size (inches)	Notes
Carry-On	22 × 14 × 9	Wheels/handles included
Personal Item	9 × 10 × 17	Must fit fully under seat

How to Measure Your Bag

1. Measure your bag including wheels and handles.
2. Compare with the 22 × 14 × 9 carry-on limit.
3. For your personal item, check if it slides under the seat (9 × 10 × 17 box).

Gotchas / Common Issues

• On smaller regional jets, many carry-ons will not fit overhead and must be gate-checked.
• United is strict about personal item size (under-seat bags are checked more closely).
• Wheels and handles DO count, so measure carefully.

Sources

United Airlines official carry-on baggage policy

✅ Yes, Delta Airlines allows 1 carry-on up to 22 × 14 × 9 inches (56 × 36 × 23 cm), plus 1 personal item that fits under the seat in front of you.
Delta also uses the “45 linear inches” rule (length + width + height ≤ 45″). Wheels and handles count toward the size.

Item	Max Size (inches)	Notes
Carry-On	22 × 14 × 9	Wheels/handles count; ≤ 45 linear in
Personal Item	Must fit under seat	Examples: purse, laptop bag, briefcase

How to Measure Your Bag (H2 heading)

1. Measure your bag including wheels and handles.
2. Add length + width + height to check the 45 linear inches rule.
3. For your personal item, test if it slides under a standard seat.

Gotchas / Common Issues

• On smaller regional jets, even compliant carry-ons may need to be gate-checked.
• Wheels and handles DO count toward measurements.
• Personal items must fit fully under the seat—oversized totes may be refused.

Sources

Delta Airlines official carry-on baggage policy

✅ Yes, American Airlines allows 1 carry-on up to 22 × 14 × 9 inches (56 × 36 × 23 cm), plus 1 personal item up to 18 × 14 × 8 inches (45 × 35 × 20 cm).
Wheels and handles count toward the size.

Item	Max Size (inches)	Notes
Carry-On	22 × 14 × 9	Wheels/handles count
Personal Item	18 × 14 × 8	Must fit under the seat

How to Measure Your Bag

1. Measure your bag including wheels and handles.
2. Compare with the 22 × 14 × 9 inch carry-on limit.
3. For your personal item, check if it slides under the seat (18 × 14 × 8 box).

Gotchas / Common Issues

• Overhead bins can fill quickly. Even if your bag is within size, you might be asked to gate-check.
• Regional jets have smaller bins, so most roller bags won’t fit overhead.
• Wheels and handles DO count, so measure carefully.

Sources

American Airlines official baggage policy