This just in...  Delta Flight arrives in NYC from San Fran. Federal Agents require all passengers to show ID
claiming they were looking for  an immigrant fleeing deportation.  Everyone had to present ID's --
Please read the details. Why? to ask yourself how would you respond if you were on the plane?  I believe
there is wisdom in using these incidents to discern your own response in the described situation. No need to argue over the authority or lack there of... that isn't why I'm presenting it. It is purely to ask, if you where there how would you respond. Please notice the photos... even granny's had ID's checked.

https://www.washingtonpost.com/news/post-nation/wp/2017/02/23/federal-agents-ask-domestic-flight-passengers-to-show-ids-in-search-for-undocumented-immigrant/?utm_term=.d4b33a9b6832