Its hard to answer this question. Airports and industrial buildings are places most of them go. But without network effect you will hardly get passengers.
The key is: network. Make more lines and try to cover more ground. Think about real life. Do the real life public transport companies go around and ask industries where their workers live and try to make a line from their houses to the industry? NO. What do they do? Well the basic: connect as much places as possible.
Cims works like real life people. They have several destinations. They don't only go from home to work. They go to shop, leisure and other homes. They also change jobs and the change homes. So forget about trying to figure out who goes where.
I start small, with buses only. Make circular lines that cover more ground with less stops. Then make another circular line somewhere and make both lines have a common stop. And keep doing that. Soon you have a hub. A stop that connect 4 lines for example. So people from any place covered by any of the 4 lines can go anywhere. The best place for hubs is airports, railstations, etc. But take care to not cause a traffic jam. If you have an avenue in a strategic place, make a tram line that connect the bus lines anywhere in the tram line. So you have a tram horizontal line and several bus lines crossing it. That is the best network effect.
