These DOT quantity limits determine the amounts of aerosol you can safely travel with, and are in addition to the security rules enforced by TSA.
Limit on can size:
The DOT limit for a single can carried in any way onboard an aircraft (checked baggage
or carry-on,) is .5 kg (18 oz.,) or 500 ml (17 fl. oz.,) per can, however, TSA's 3-1-1 rule
for carry-on baggage
currently applies as well!
This means that a passenger could carry 5 to 7 average size (10-14 oz.,) aerosol cans.
Most aerosol cans are well below the 18-oz., limit, but check the labels of your large aerosol cans before packing them!