The EFD (Electronic Flight Data) system rolled out at the Scottish and Oceanic Air Traffic Control (ATC) Centre at Glasgow Prestwick Airport has had difficulty handling complex inputs, according to people posting on an air traffic control forum.

"[Controllers] don't want to use this system, not because they like to have a whinge, but because they know it is neither safe, nor efficient enough to do the job," wrote one Prestwick controller, Arty-Ziff, on the Pprune forum in February. "This system should have been tested properly before it went into live operations."