No photo of it - the "airbag" is the buldge on the seatbelt. I assume there is something inside that is supposed to inflate. This solution seems to be very common on seats that are mounted sideways (SK being the notable exception, they employ a traditional 3-point seatbelt like found in cars).

The pouch containing the "airbag" is what I swiped.
Here is a random photo I found from googling it.