This conversation relates only to sporting firearms in transit as checked baggage through an Airport other than the departure or final arrival airport. In this case Newark. Handguns and certain ammunition are restricted in New Jersey and this is where issues have occurred.
I get as confused about the South African regulations and way of doing things as you are in regard to this issue. There are no silly questions when it comes to regulations.
When returning from overseas most all passengers clear customs at their first point of entry into the United states. Typically, their bags are checked though to their final destination and location such as Newark, Atlanta, Chicago and such are connection hubs for their onward journey.
Upon arrival you collect your baggage and firearms and clear customs/immigration. As you exit there is a transit counter where your baggage is collected and sent on to your destination. You are not possessing your firearms outside of the TSA security and are continuing, uninterrupted, your interstate travel plans.
If you checked your bags to Newark and walk out past TSA into the Terminal, you are no longer in Interstate transportation of your firearms. Now there could be an argument that you are heading straight to your vehicle and driving back home to Connecticut and that is a continuation of Interstate transportation. That is where the discretion of the officer, if you are discovered, would come into play.
Even though I looked at flying into Newark and taking a Limo over to JKF to catch Emirates, I did not look deeply into this scenario. The transfer seems to be legal however it is open for interpretation and it was not worth the bother getting clarification fo NJ Port Authority as the Untied option presented itself.
18 U.S. Code § 926A - Interstate transportation of firearms
Notwithstanding any other provision of any law or any rule or regulation of a
State or any political subdivision thereof, any person who is not otherwise prohibited by this chapter from transporting, shipping, or receiving a
firearm shall be entitled to transport a
firearm for any lawful purpose from any place where he may lawfully possess and carry such
firearm to any other place where he may lawfully possess and carry such
firearm if, during such transportation the
firearm is unloaded, and neither the
firearm nor any
ammunition being transported is readily accessible or is directly accessible from the passenger compartment of such transporting vehicle: Provided, That in the case of a vehicle without a compartment separate from the driver’s compartment the
firearm or
ammunition shall be contained in a locked container other than the glove compartment or console.