Well this goes way back, but while I was on a PeopleXpress flight from EWR to London, Muhammed Ali and his entourage took over most of the first class cabin.
Yes, they did have first class on their flights to London and Brussels - even at the time it was a bargin, but I was too poor to consider it (I seem to remember $750 each way).

By the way, I still remember the coach meals PeopleXpress sold on their international route - a wicker basket with sandwiches, cheese, freah fruit, cookies. I would prefer on eof those to any other meal i've had on a plan, first, business, or coach!