While living in Kenya I visited the Sheldrake elephant orphanage and also was fortunate enough to get to know a pilot working for our firm who, together with a lady, had flown at least one infant orphan elephant to Nairobi in a twin engine light aircraft. The stories I heard from both sources, and what I saw at the orphanage, left me believing that elephants are quite remarkable animals with very obvious signs of emotions, especially empathy and very strong attachment. The cow/mother seen in the video was sniffing the air trying to identify the scent of those whom she very possibly associated with being reunited with her calf - she likely really wanted to be able to recognise them. I think it quite likely that, if the air movement was right, she will remember the scent and store it in her "goody bag" department.