AA1621 takes a few routes. The most frequently flown is between Charlotte, NC (CLT-Charlotte-Douglas Intl.) and Tampa, FL (TPA-Tampa Intl.), which is a direct flight. This service usually takes 1 hour and 42 minutes. That said, there may be other flights with the same number that have one or more stops.
You'll probably be climbing aboard the Airbus A320 if you've reserved a ticket on flight number AA1621 from Charlotte, NC (CLT-Charlotte-Douglas Intl.) to Tampa, FL (TPA-Tampa Intl.). This is the most commonly used type of aircraft on this busy route.