Here we are not just talking about any taxi service. But someone who is known and paid to go to airport pick certain people up probably showing a sign or something to indicate to candidate that they are there for them. Includes things like being compensated for any wait time for delays likely. Drop them off at hotel. Go pick from hotel again and then likely deliver to right place in office and even give instructions where to go there.

Perfectly sensible service to out-source and something that you want to work each time or have responsibility to arrange someone else to do same thing.