On a positive note, I remember returning back to the United States after spending a couple of weeks in Saudi Arabia providing teacher training to language instructors there. It was a wonderful experience, and after the training, I was looking forward to being back home. Before I boarded the plane, I was pleasantly surprised to find out I had enough extra flying miles to upgrade me to first class, something I wasn't expecting, but I didn't pass up the chance to ride up front for the first . . . and probably last . . . time in my life.
On the other hand, I have had my share of unpleasant experiences in flying, and on one occasion abroad, my flight was delayed for over six hours in an international airport that resulted in my missing my connecting flight once I returned to the United States, causing me to have to stay in a hotel once extra night. Spending time in an airport in another country where you don't speak the language and you don't understand the flight announcements can be mentally and emotionally challenging. I just tried to smile and count my blessings that I had a family back home that was waiting for me.
Now, these experiences are not very extreme in nature, but it is likely that you have had both your share of good and bad travel moments. Please share them with us.