Aircrafts for dummies

Many times technical problems for crews in the air flying towards their destination are sorted out be technical staff on the ground that assist the pilots to resolve various issues. Quite often the passengers are never aware of what is going on. However there have been cases of serious emergencies where passengers have noticed that there is something wrong with the plane, but when they are resolved and the plane lands safely, very few of them realize that there has been help from the ground.