i remember working on the ramp in DTW for Mesaba there was a few ramp agents would stay almost 4 hrs extra on the night shifts collecting cans from the trash dumpsters (yea they were dumpster diving for the most part) collecting cans from the 747s. They would collect at times 5 to 10 garbage bags full of cans and would turn them in. Was told that Mesaba nor NW or any of the other airlines at DTW really cared since they "put them in the trash" so they had the right to collect them. They claimed they made upwards of 5000 a month just on cans (from what I remember). Could only imagine what a major airline and all the cans they go thru how much "extra income" they could produce from recycling those cans.