Originally Posted by
PWMRamper
The thing is, there's a wide variety of Delay Codes, if I had to guess about 40 of them. But you'll only see a select few reasons posted on stuff like United.com.
82 delays codes as of Nov 2009, although the ones you see are "roll ups" ATC could be gate hold for local ramp traffic, a flow control delay, a separate request by the tower, yet all of these are ATC delays. Delays for customer service could be due to over-sales, gate check bags, slow boarding, special needs customers, a slow cs agent, short CS staffing...yet they will all show delay due to customer service
Of the 82, there are a handful of them I have NEVER seen used (a few are only used for extraordinary circumstances