The Monarch 720s, and later the 707-138s were used mainly round Europe, many happy hours spent on the jump seat, it was certainly overpowered.
Monarch didn't get involved with the affinity charters, but they did venture outside of Europe occasionaly, The most common route was St Lucia, via Santa Maria or Gander, although they did occasionaly come back direct, usually short of fuel and requesting a straight in on 08!