Look like it's may be an IT issue and has just been fixed now. Most of the cheap JASA fares do come back (I did a check an hour ago all these JASA fares still quoted skyrocket high!!). Can anyone verify? My guess is there may be a bug in the IT system or the system is under maintenance or...
Citibank plat card comes with free travel insurance which could be an added bonus and significant savings if you use the card to pay for overseas airtickets (in particular month-long holiday in US and Europe), though both WOW and Citibank cards earn QF FF points.