Yes Clipper110A, Ladeco had great single class service until the late 1980s when they introduced Business Class. I flew them a lot between the early 1980s and mid-1990s. Here are two domestic menus from 1986 (with my translations from Spanish), and I'll try and post some international menus later.

Ladeco Domestic Flights 1986

Lunch

Stuffed Cornets of Ham

Chicken Marengo or
Fillet of Fish with Mousseline Sauce

Duchesse Potatoes and Carrot Batons

Chocolate Log Cake or
Charlotte Russe
Fresh Fruits
Coffee

Dinner

Palm Hearts with Golf Sauce

Coq au Vin or
Alsace Smoked Pork Loin

Parsley Potatoes and Florentine Spinach

Caramel Bavaroise or
Lemon Pie
Fresh Fruits
Coffee

Ah...the memories!