At the end of January I was able to book QF254 (codeshare with the operator Jetstar, JQ58). Some weeks ago I wanted to change the date (which I'd already done several times with no problem). Now there is no availability for this flight around my preferred date or any date that I entered - soon, far, whatever.

Not only that, but using AA.com to look for QF flights on other itineraries does not pull up any JQ flights as it had in the recent past.

Is there something weird going on since I don't think this is a normal availability-all-award-seats-taken kind of issue since it seems to be affecting many flights at seemingly all times.

Cheers.