The term Aircraft On Ground (AOG) … comes from the language of the aviators and describes the condition that an aircraft is not ready to fly for technical reasons, ie must remain on the ground.
When remedying such an incident, it is then necessary to bring needed spare parts and often executing staff as quickly as possible to the defective aircraft to perform the repair can (Source: Wikipedia)
For sure, AOG it’s not really applicable for the planes in this photo series, but…
I am sure, even today, they remember their days in the clear skies, high above. Is it that, what appears in their dreams?