Not YET Do you even know what the problems were or how the dispatch reliability of N195DN compares to Delta's other 767-300s? There are any number of non-safe

Not YET Do you even know what the problems were or how the dispatch reliability of N195DN compares to Delta's other 767-300s? There are any number of non-safety-related reasons a plane might return to the gate, especially on a long haul flight e.g. problems with the toilets. Take a deep breath. Nothing with N195DN was a close call.