On the many flights I have been on in the last 30 years, I have only been nervous twice.
The first time was on a flight from Zanzibar to Nairobi when the pilot exclaimed over the loud speaker, "Have a safe flight!"
The second time was on my flight to Timbuktu. After we reached a safe altitude, the co-pilot became our steward as he pushed a trolley down the aisle and handed out croissants and juice. Half way through his duties, the captain also left the cock pit to use the bathroom... located at the back of the plane. Longest three minutes of my life.
Now, I know planes run on auto pilot, but there's a security in knowing someone is keeping watch-- just in case, right?