why business travellers prefer to travel by air transport rather than other transports? advantage?

Speed for obvious reason if the distance is substantial.

Of course there is safety. It is actually safer to travel by air than driving.

Thirdly.. if you are conparing long distance bus or trains... airplane is actually not as cramped. ( here at least ) and there are less unsavoury people that we do not want to mix with on trains and buses.

speed - you can also get work done (or just relax) while waiting at the airport and on the flight.

Status!Same reason they travel First class rather than economy