VJ offers a better pay and time off package for locals.
As Luke inferred many local VN pilots are making noises about going over to VJ, however they still need to be released from the 15yrs- lifetime (retirement age) training bonds. Last TRE who left had to bring a lawyer and pay off his not inconsiderable bond. Also..
The CAAV will accept either A320 or a321 time, they issue a license to pilots to fly 320's but VN only have 321s. 319 however does seem to be a sticking point.
Disagree with Luke that VJ is not short of pilots, talk to the guys there. Their short and with an aircraft a month (to fulfill 92 a/C order) going to get shorter, unless they do a Skymark (380).