A world with a sudden limit on air travel would be tremendously different from the one we live in now.
The embrace of a new technology by ordinary people leads inevitably to its embrace by people of malign intent.
A smartphone links patients' bodies and doctors' computers, which in turn are connected to the Internet, which in turn is connected to any smartphone anywhere. The new devices could put the management of an individual's internal organs in the hands of every hacker, online scammer, and digital vandal on Earth.
Smartphones can relay patients' data to hospital computers in a continuous stream. Doctors can alter treatment regimens remotely, instead of making patients come in for a visit.