The launch advertiser, Cathay Pacific, used the system between the business districts of Admiralty and Wanchai, currently the only leg of the MTR network where the system has been installed.
Vince Viola, McCann-Erickson regional senior vice-president and multinational accounts director, said: "At present, we have negotiated the only poster site.
"We will consider expanding sites as the MTR expands the Motion Poster system to other districts but this is really a question for the MTR as to when, where and how many sites they might add."
The silent McCann-developed commercial creates the illusion of a passenger framed in the window of an Airbus travelling parallel to the train carriage.
The air traveller acknowledges the viewers in the train with a wave. The aircraft then banks gently, before drifting off into the horizon.
"The challenge for the agency was to create a specific concept that was relevant to this medium. Ultimately, the communication that we've produced is simple, entertaining and relevant to Cathay Pacific, said Bill Venn, McCann's Cathay Pacific central team creative director.
Viola added that Hong Kong's flag carrier was the first to use the medium because "Cathay Pacific has a goal to be seen as one of the world's most admired brands. Part of our strategy in achieving this is to constantly be seen as innovating".
However, media agencies said that there was insufficient hype surrounding the new medium to alert commuters to it. "There is now a danger of it becoming another advertising wallpaper, one said.
