Likely Air Transport Association of America, Inc. v. Cuomo, 520 F.3d 218 (2d Cir. 2008). In this case, New York attempted to enforce a Passenger Bill of Rights law that required airlines to provide adequate food, water, ventilation, and restroom facilities during lengthy tarmac delays. However, the law was struck down by the Second Circuit Court of Appeals, which ruled that federal law preempts state regulations in aviation matters.

This is 16 year old case that didn't file for Supreme Court review so it is strange the parent comment would use it as an example of "The simplest way to figure out the current court...".