It’s the crew and ATC staff, definitely, but also
- the amazingly well engineered airplanes (despite recent Boeing hiccups - just goes to demonstrate the high standards) with many redundancies;
- the archaic, but robust ATC system; and
- last but not least the excellent safety culture, which investigates problems thoroughly to the root, but without blaming individuals.
It’s the crew and ATC staff, definitely, but also
- the amazingly well engineered airplanes (despite recent Boeing hiccups - just goes to demonstrate the high standards) with many redundancies;
- the archaic, but robust ATC system; and
- last but not least the excellent safety culture, which investigates problems thoroughly to the root, but without blaming individuals.