First off bag data between IATA carriers is supposed to be seamless on a 10 digit standard. However...at first point of contact with the second carrier ensure that your bag data is edited to your checkin record...show the AA
agent your DL
claim checks and make sure they are entered. This is especially important if your next
flight is international so that they clear positive bag match correctly.
Before you ever checkin make sure all old bagtags are off your bag...and also any barcodes that may have been attached during prior travels. Next make sure your personal ID
tag includes your correct address and cellphone...and that there is a duplicate inside your bag. On your name tag..both inside and outside...make sure your flight itin is marked down. Lastly...do not attach your external name tag to the handle the bag tag would be applied to...always attach at a different area in case the main handle comes off.
Do not attach ribbons, yarn, or other items to the handle that may block either visually or electronically seeing the bag tag itself. May help you identify at the destination on the claim belt but before then they can block scanners and readers forcing your bag astray.
Lastly...check in early to give the TSA
time to examine or hand search your bag if they see something on their machines that gives them pause. Failure to clear TSA
in time for baggage screening is now one of the more major reasons for bags not flying with you. Remember that if you come into the US that your bags will go thru rescreening by the TSA
during your transit even though screened on your begining flight. That little bit really impacts pax from Canada and the Caribbean as pax are precleared but the bags are redone by the TSA
taking far more time to connect. For instance an under 45 min connect from a Canadian city at a major US hub going onto another domestic city usually will result in no luggage...even though the connection is sold as a legal connect.