I know this may have been asked before. We are flying Jetstar ( yes I know we are game!!!!) Have always flown Garuda and paid extra at airport for upgrade which gave us automatic entry into lounges ( not to mention a much more comfortable flight). Can we still get into the Premier or Prada lounges if we fly Jetstar ( not Starclass).Do we just roll up to the lounges and ask how much ?. Thanks for help.