From a constitutional and economic point of view, I would like to withdraw from the EU, as would large numbers of Brits. From an aircrew point of view, the EU seems to have made not the slightest difference to job prospects. You cannot get a job with a French airline if you don't speak French or Lufthansa if you don't speak German.
The notion of a common licence is attractive, but looks to be a long way away. And if you only speak English it will do you no good with the majors. Without a common language, there can be no free movement of labour around the EU.
There are many areas where the respective authorities could co-ordinate policy, but they do not need the EU and its institutions to do this. They could do this in a free trade area. Norway is involved in JAR/OPS but is not in the EU.
If you want to know more about the constitutional and economic implications of remaining in the EU, try
www.globalbritain.org. It is one of many Eurosceptic sites and will have links to many others.