The focus is more on mass arrivals than it is on planes. Having said that, the reality is that in many cases, people who arrive on a plane are not necessarily smuggled. They may have smuggled themselves, but they may not be part of a large smuggling ring.
I'm not sure the same things.... The focus on smuggling was to look at people who arrive.... People may be legitimate refugees if they arrive on an airplane. The purpose of much of the legislation was to deal with events where human smuggling was involved. You had people who were smuggling for, in some cases, a lot of money.