I have to side with JALPAK on this one. It is very frustrating. Hard to do any changes online, and often very long wait from call center. I usually pay biz or first, but am not MPC and the wait is typically much, much longer than for any other airline. I can understand that MPC gold or DM are better treated, but I pay good money and their call center understaffing is not consistent with a top-quality airline. Once reaching an agent, they are usually efficient (hence well trained).