There are two kinds of 'worst flights'--ones where yoTobu think, we could have died, and ones where the conditions were so horrible that you find yourself thinking, how bad would oblivion be? As to the first one, I had a flight into Seattle in the 1980's where on landing we suffered violent windshear--the pilot managed to maintain some semblance of control, but did scrape a wing tip on the touch and go. (This made my daughter detemined never to fly again, which indirectly led to my deciding that we'd take Amtrak cross-country to get her to college). In the 'horrible condtions' department, on a flight from Los Angeles to Beijing sometime around 1995, my seatmate was an elderly Chinese guy who had a large plastic bag on his lap, into which he spit phlegm on a regular basis. By the time we got to Beijing, the bag contained a couple of cups-worth. I skipped all the meals on that flight...