MARC Rider:
Actually, I was referring to THE Good Old Days. Like the 50s and 60s...
I think I was born 40 years too late...
OK, (1), I was half Joking, and (2):
By the end of the 60s, when I started flying on airplanes, it was common to joke abut the perceived poor food quality, in coach, at least. "Such lousy food, and the portions are too small!" I think there was was also something about how the chefs for the airlines hadn't yet perfected techniques to make food taste good when served under the low pressure (~8000 ft. altitude) and low humidity conditions of the typical airline cabin. I particularly remember a nasty pot roast served up by El Al out of New York in 1971, but to be fair, they served up a good New York lox and bagel sandwich for breakfast. When I flew El Al in 1989, I think they served the same thing, but the recipe had improved. The best coach in-flight service I ever had was on British Airways in 1985. They not only served us our choice of cocktail, wine with dinner, and after-dinner drink (not top-shelf, but not nasty, either), they also had the steward serve us our main dish (some kind of roast beef) individually, with silver tongs.
During the period 1970 - 1990, my personal experience was the the food was nothing to write home about, but it was perfectly serviceable. When I used to fly to and from college PHL -ORD, I would make it my business to get a meal flight, not because the food was so great, but because if I didn't, meal time would occur when I was at the airport, and the food options at airports back then were much worse than what was served on the plane. Plus it would have been extra money out of my poor student pocket.
I noticed that things were going downhill some time around 1986. First my breakfast flight from Dulles to Denver on Frank Lorenzo's Continental had a menu choice of cereal, yogurt, breakfast sandwich, pick 2. Then, when I was at Stapleton waiting to fly home, I finally noticed that the terminal had been redesigned, and with the crowd, much larger than back in my college days, it had all the ambiance of a bus terminal. Then there was an American flight to Chicago in the 1990s where we picked up a bag lunch from a cooler at the gate. You could still get reasonably full service on longer flights, but soon after 9/11, that all went away.