We got one or two opposite cases here on BSF
:viewtopic.php?f=12&t=60258
That Navi bezel locked in flight and was working OK on sea level.
And another one here:
viewtopic.php?f=12&t=49058
Now we have another case of weird Navi bezel behaviour connected to flying and still no idea what could be causing it.
I wonder - pressure has nothing to do with it, commercial aircraft are pressurized. Maybe humidity ?
I found this article:
http://www.askthepilot.com/questionansw ... r-quality/
It says: "If passengers have one very legitimate gripe, it’s about dryness. Indeed, the typical cabin is exceptionally dry and dehydrating. At around 12 percent humidity, it is drier than you will find in most deserts. This is chiefly a by-product of cruising at high-altitudes, where moisture content is somewhere between low and nonexistent. Humidifying a cabin would seem a simple and sensible solution, but it’s avoided for different reasons. First, to amply humidify a jetliner would take large quantities of water, which is heavy and therefore expensive to carry. Humidifying systems would need to recapture and recirculate as much water as possible, making them expensive and complicated. They do exist: one sells for more than $100,000 per unit and increases humidity only by a small margin. There’s also the important issue of corrosion. Dampness and condensation leeching into the guts of an airframe can be damaging."
I found another source that claims as low as 4% humidity inside commercial aircraft, Boeing 787 being slightly better. So the air is very dry inside the cabin. Maybe this has some effect on Navi bezel that has a specific construction unlike other watches.
While I have Navitimer Heritage I must say that I never flew with it so didn't check the effect myself, but if opportunity arises, will do
P.S. I found a scientific study of air quality and relative humidity in commercial aircrafts so you can enjoy some more data
https://core.ac.uk/download/pdf/53284046.pdf
If your Navitimer bezel is still blocked, maybe you can free it using this advice:
O2AFAC67 wrote:
Read a suggestion on another site to try dental floss to "degunk" under the bezel. Both my display back Cosmonaute and Old Navitimer bezels were so tight I could not move them at all without superhuman effort. Cut a long (10-12") length of dental floss, pushed the center of the strand under the bezel at one position and wrapped the strand around almost to where I started it. Pulled it around a couple of times and voila'! Worked great! The Navi bezel returned to its original (as I recall) perfect tension and the Cosmo bezel returned to its original tension as well. The Cosmo was always a bit tight but easily usable and it is again now. Give it a try. A very useful and easy technique for sure!
Cheers,
Ron
Cheers,
Ron
Good luck and enjoy your Navi
. He shrugged and said they'll address the bezel's attachment to the case the next time they service it 
