Please review your airlines baggage policy as they can update/change at any time!
Typically you have 1 free checked bag of 50 Lbs and 1 free carry on plus 1 small personal item for free.
Delta:
https://www.delta.com/content/www/en_US/traveling-with-us/baggage/before-your-trip/checked.html
American Airlines:
https://www.aa.com/i18n/travel-info/baggage/checked-baggage-policy.jsp