Oh my. I got great advice about trips.
The most important were weather related. Unreal, but my son got stuck 4x during winter storms, 3x at Philly airport. I got instant responses about trains being shut down, so could tell son to get a room one night. When he was stuck in NJ, and had to be in SF next day, people offered advice to get to a different airport by train, then fly to NC, and from there to SF.
There is no way we could have gotten this information, if not. For people living in these areas.