Last summer I was fortunate enough to take part in a delivery flight of a brand new 737-900ER from Seattle to Atlanta. These flights occur immediately after ownership is transferred from Boeing to the company. Only a small number of people are allowed aboard and the flight is not operated under Part 121 commercial flight regs. I found an unattended window and mounted my GoPro to it. The linked video is the resulting time lapse.
Today, I am at SeaTac Airport and that same plane is talking me home along with a full cabin of passengers.