American Airlines:
- First class: 4 pieces up to 70 lbs each
- Business class: 3 pieces up to 50 lbs each
- Economy class: 2 pieces up to 50 lbs each
- Basic economy class: 1 piece up to 50 lbs
Delta Air Lines:
- First class: 3 pieces up to 70 lbs each
- Business class: 2 pieces up to 50 lbs each
- Economy class: 1 piece up to 50 lbs
- Basic economy class: 1 piece up to 50 lbs
United Airlines:
- First class: 3 pieces up to 70 lbs each
- Business class: 2 pieces up to 50 lbs each
- Economy class: 2 pieces up to 50 lbs
- Basic economy class: 1 piece up to 50 lbs
Southwest Airlines:
- First class (Anytime, Business Select): 2 pieces up to 70 lbs each
- Economy class: 2 pieces up to 50 lbs each
- Basic economy class: 1 piece up to 50 lbs
Aeromexico:
- First class: 3 pieces up to 70 lbs each
- Business class: 2 pieces up to 50 lbs each
- Economy class: 2 pieces up to 50 lbs
- Basic economy class: 1 piece up to 50 lbs
Viva Aerobus:
- First class (Viva Business): 2 pieces up to 55 lbs each
- Economy class: 1 piece up to 44 lbs + Carry-on bag
Volaris:
- First class (Volaris Plus): 2 pieces up to 55 lbs each
- Economy class: 1 piece up to 44 lbs + Carry-on bag
These allowances may vary depending on the airline and the specific fare you purchase. It's always best to check with your airline directly to confirm the baggage allowance for your flight.