As I retired airline Captain, let me chime in. Scheduling is one of the toughest jobs in aviation. The FAA rules are very specific.
You can be scheduled to fly no more than 8 hours in 24. You can exceed that due to bad weather or maintainance issues. However, if you go over eight hours of flight time, you need to have double your flight time off instead of the normal eight. If you went over by one hour (9 hours) then you need 18 hours off. If you know your are going to go over 16 hours of duty time on your next leg, you can't even take off.
Even if you are flying on US Airways, out of their Charlotte hub, They may run out of reserves if there is widespread bad weather.
Eric
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