How do you manage to always find the free time for run even though the conditions doesn't allow it? Like for example if you take a flight of 16 hours.

Once I did 5k running with my son in mostly empty terminals of an airport while on a layover. We were training for a race and didn’t want to miss the day.

The 16-17 hour flights from the US to Asia are really hard to manage when you are trying to run every day. Depending on when you take off, you may be in the air an entire calendar day, based on starting the flight in the time zone were you leave in the US and ending it in the time zone where you land in Asia. (Like Singapore airlines flight 23. Takes off 10:15 pm from New York on a Wednesday and lands 19 h 15m later on Friday morning 5:30 am in Singapore.) Either you decide that your first run in Singapore is going to be on New York time, or you say running in place on the plane is going to count, or you don’t take that kind of flight.

Flying the other way is easy to keep your streak with though. Take off from Singapore at 11:35 pm and land in New York at 6 the next morning (18 1/2 hours later)

I'm not a run streaker, but am an avid runner and if you "only" need to run a mile you really only need to find 15min in a day to keep your streak alive.

I don't want to speak for the OP, but most people don't take a 16 hour flight ever in their life.

Yeah, 16 hours is crazy long. I would add that I found the best thing to do on both sides of a lengthy flight (say 6-8 hours) is exercise.