of either three or four selections, I assume that you'll be providing small, maybe a quarter to a half of the normal size, tasting portions of each one. Consequently, for two to four people to order a flight of four desserts is excessive but not insanely so.
What turns that order into something crazy is when what the restaurant means by a "dessert flight" is full-sized portions of the dishes, as Chef and the Farmer did on my recent trip there.
From the top left, that's crispy pound cake with strawberries and lemon curd, a wonderful strawberry cobbler with basil ice cream, a chocolate chess pie with bourbon ice cream, and one of the best carrot cakes I've ever tasted.
I learned two lessons from this experience: Chef and the Farmer makes excellent desserts, and never assume what a restaurant means by "flight."