When I worked for Pan Am (not the old Pan Am) considering I am 21, they put winglets on their 727's until they blew out their #2 engine on takeoff and it became very unstable around the longitudal axis. The A/C had a dutch roll tendency. Does anybody know if this is a common problem with winglets and if it will actually deter companies from adding them to their A/C? After that incident Pan Am took them off the rest of the fleet. I personally think they make an A/C look sharp. I like them but I would not want them if it made the plane unstable.