While weight allowances can vary from one airline to another, for most fliers, checked baggage may weigh up to fifty pounds at check-in for domestic flights, as of July 2015. First-class fliers sometimes have the option to check bags that weigh up to seventy pounds.
While there may be special allowances for privileged fliers, the 50-pound limit is common across major carriers. In addition, the rules often vary for international flights and active duty military personnel. Military personnel are often given additional free checked baggage or higher weight limits. For example, Delta allows active-duty military personnel flying on orders to have four free checked bags of up to 70 pounds apiece, as of 2015.