Narrative:

E170/Q; (mem J42 gve KORRY3) was navigating direct gve instead of navigating via J42. When [the crew] was challenged on their route; they stated the flight plan they filed was txk J42 gve and they were given an amended pre departure clearance of txk J42 mem then as filed. They understood the pre departure clearance to mean proceed direct gve after mem. Other than the call sign; this incident is exactly the same as another incident I investigated back in [a few months ago] involving a hawker. Like the E170; the hawker (bkw J42 gve JAIKE3) departed out of dallas-ft. Worth airspace and proceeded direct gve after mem due to the same amended pre departure clearance (txk J42 mem then as filed).two possible options in order to rectify the situation:1) move the last fix of the amended pre departure clearance back further west on J42 2) treat an amended pre departure clearance as a frc and read the entire clearance3) pilot education

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Original NASA ASRS Text

Title: A ZID Controller and the flight crew involved describe a track deviation due to a misunderstanding of the amended PDC.

Narrative: E170/Q; (MEM J42 GVE KORRY3) was navigating direct GVE instead of navigating via J42. When [the crew] was challenged on their route; they stated the flight plan they filed was TXK J42 GVE and they were given an amended PDC of TXK J42 MEM then as filed. They understood the PDC to mean proceed direct GVE after MEM. Other than the call sign; this incident is exactly the same as another incident I investigated back in [a few months ago] involving a Hawker. Like the E170; the Hawker (BKW J42 GVE JAIKE3) departed out of Dallas-Ft. Worth airspace and proceeded direct GVE after MEM due to the same amended PDC (TXK J42 MEM then as filed).Two possible options in order to rectify the situation:1) Move the last fix of the amended PDC back further west on J42 2) Treat an amended PDC as a FRC and read the entire clearance3) Pilot education

Data retrieved from NASA's ASRS site as of July 2013 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.