justinbrett
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GDS systens like Amadeus tend to operate in UTC as a universal standard time. Same for airline ops too I think. Keeps everything consistent.
UTC and GMT tend to be used interchangeably though UTC is more modern nomenclature. Also known as Zulu time.. ie you may see 0000Z as a reference.
Most of aviation runs on UTC. It’s really just the passenger facing stuff that gets translated.