Generally, American Airlines (AA) allows you to check your bags starting 4 hours before your scheduled departure time. This is a standard policy designed to prevent the baggage sorting system from becoming overwhelmed with luggage for later flights. However, there are exceptions; if you are departing from a major hub like Dallas/Fort Worth (DFW), Charlotte (CLT), or Miami (MIA), the airline may have more flexible "early drop-off" windows, though 6 hours is still quite early. It is important to note that many airports have strict security regulations that prohibit the storage of checked luggage for more than 4 to 6 hours before a flight. If you arrive 6 hours early, you might be asked to wait with your bags in the public departures hall until the 4-hour window opens. For those on an "overnight" layover or connecting flights on a single ticket, AA will typically hold your bags through the duration of the layover. If you have "Elite Status" or are flying in First/Business class, agents may occasionally grant an exception for an early drop-off if the counters are not busy, but the 4-hour rule remains the official guideline for the vast majority of travelers to ensure operational efficiency.