This guy filmed this video with just his phone while all alone in Las Vegas' airport. He describes in his comments how he did it:
"I had a person behind a ticket counter give me a roll of luggage tape before she left. I then used a wheel chair that had a tall pole on the back of it and taped my iPhone to that. Then I would put it on the moving walkway for a dolly shot. I also used the extended handle on my computer bag and taped the iPhone to my handle. I would tuck different stuff under the bag to get the right angle. For the escalator shot I had to sprint up the steps after I got my shot so the computer bag didn't hit the top and fall back down. Quite fun!