Having handled diverts as a callow youth, 70-odd stressed businesspersons bearing down on one solitary ground agent, barely out of uni., I can assure you that they are not something to joke about.
Teesside, Leeds and Newcastle had their own unique microclimates.
Short flying times between them all meant very little warning of diversions.
One autumn night at Teesside, we had five "drop in" within the space of ten minutes, all at the end of a shift...