Update: This is just an experiment with no plans of actual public implementation. SAS has provided NFC tags to EuroBonus Gold members for a long time. The tag contains only the EuroBonus ID, in an encrypted format. Only SAS can write valid EuroBonus ID data to NFC tags. When traveling, you are always required to provide a valid ID when requested.
A few weeks ago I had an NFC chip implanted into my hand, just beneath the skin. While I am certainly not the first person to have an NFC implant, I am probably one of the first travelers to pass through Stockholm Arlanda airport, through security, at the lounge, and finally through the gate to the aircraft, using only the chip in my hand.
My NFC chip contains my Scandinavian Airlines EuroBonus member ID, and since the airport has NFC readers all the way from security to the gate, I can use the chip instead of ordinary boarding passes.
In the video below, you can check out how it went at the airport, and you can also meet Massimo Pascotto, working with innovation at SAS, and listen in on a conversation we had about the experiment. At the end of the video, you can see how the actual procedure went. Viewer discretion is advised.