I had booked two MileSAAver seats JFK-TXL and TXL-ORD in last fall for this upcoming July. I switched my return to AA (AB was being a pain with seat selection for my wife on a split PNR). But in looking for new flights, I've been continuing to search daily for months. There was plenty of AB availability on many days last year. By late January, it had started to disappear. I currently only see BA flights getting me into CPH. I was surprised at how much AB inventory was out there (both Y and J). I assume it must be mostly snatched up now (at least for the days in July I'm searching for).