Yesterday (March 3) I flew Jetstar Pacific 596 from SGN to DAD. The airplane contained markings for vueling.com, the crew was wearing vueling uniforms, and despite being a domestic flight in Vietnam, flight announcements were made in English and Spanish. As far as I can tell, Vueling is a low cost carrier in Spain and this wasn't a code share flight.
It looks like this may have been the plane: https://m.planespotters.net/airframe/Airbus/A320/5940/EC-LZF-Jetstar-Pacific-Airlines
Can anyone explain what is going on? I've never seen anything like this before.