Wirelessly posted (Mozilla/5.0 (BlackBerry; U; BlackBerry 9900; en) AppleWebKit/534.11+ (KHTML, like Gecko) Version/7.1.0.391 Mobile Safari/534.11+)
This is completely wrong. As long as it's an AC PNR, there is no reason why an agent can't link them. Doesn't matter if it's different channel, date, etc...so long as flights are all the same.