The issue is that a culture of self-interested mismanagement from factory floors up to our highest political offices has led the global economy to depend on the success of this plane which kills people.
Even if somehow by chance they manage to make this plane kill fewer people in the future, there will be no reason to think the actual problem has been addressed.
In France the train is ~50 x more carbon efficient. We will not be able to keep emitting like crazy forever (we actually should have stopped completely already :/ ) , especially when reasonable alternatives exist (the train if going not too far, teleconferences, ...). If we believe in the markets, the price of an air ticket should be maybe 50x higher than what it is today, in order to stop the insane emissions. Alternatively there could be an authority who decide if we have a good reason to take the plane.
People certainly immigrated before the airplane, but in general those were individuals without many options at home. Skilled immigration really took off during the Jet Age.