API - US carriers

Sorry search didn't find anything relevant...

I am travelling to JFK (poor me) with Delta on Saturday (as the businesselite for £600 was too good to not try) and I have not been requested to provide any API. In fact when I have called Delta to ask if I need to add API the response I get is that they cannot change any of the details of my booking as I have a none-change fare code... I realise that is totally unrelated but that sums up the level of understanding that their call centre have (not sure where they are based but it is not UK or US).

Is there some reasons why I would not need to provide this in advance as it is a US carrier? Or alternatively will they just make me give the details on check in?

Thanks

[preiffer]

""In advance" also equals "at check-in". VS just try to ease the process by bringing it forward online.

Thought so - although I do think that this is the most extreme case of unknowledgable customer service staff I have come across..

First guy said my ticket details couldn't be changed due to the fare code and the second said that my payment had already been processed and therefore they didn't need any more information.

All very strange!