I've decided to play around with the booking engine for an upcoming DONE4 I have, and D availability on many segments appears very very poor, much more than in my experience using the phone. For example, I'm trying to book a HKG-CDG segment, and only BA comes up via LHR, for days on end, even though there are 3 CX non-stop flights a day. Same for a BOS-GRU. Only BOS-MIA-GRU comes up, never BOS-JFK-GRU, for weeks on end. Is D availability really that bad, or is this engine kak?