But don't call and try to combine or ask them to increase the first LoC by the amount of the second LoC or anything like that. I ask them to put in a request to increase my first LoC by the limit of the second LoC. Well the put in the request but also closed my second LoC account. Guess I ask for it LoL. I bet you they will deny the request. But it doesn't matter, better to be upfront and honest with Amex than risk suffering any consequences later on I guess. Maybe I get lucky ( like Saar ) and will receive the increase on my first LoC.