It's advertisements by Malaysia Airlines (MAS) and there were a few of them.
Each poster showed flights offered by the airline to different places with the departing and arrival destinations indicated at both ends with a photo of the destination's iconic scenery in the background. So there's Singapore to Kuala Lumpur with the twin towers in the background, and so on.
And between, these two destinations, there's a sentence as follows:
"1 captain . 1 co-pilot . 6-member cabin staff . 3 boarding gate service staff . 6 baggage handlers"
For longer flights, they'll have 2 captains, 2 co-pilots, 28-member cabin staff....."