Last year I arrived at IAH too late to catch the last flight to DCA, a lot of flights were delayed that day, so I was told that there were no rooms available near the airport. Not wanting to spend a night at the airport I asked at the President's club if they could put me on the next flight to EWR, and then to DCA the next morning. No problem! The next flight to EWR was leaving in 15 minutes, a 777, and had 1 F/C seat left. This gave me the opportunity for a quick visit with my brother in NJ. The 777 has the best ratio of F/C to coach seats.
As Sheryl says: "Ya just never know."