Is there any benefit to folding wings on commercial aircraft? This video shows NASA researching folding wings, in what looks like a model of an airliner. What would be the benefit to this technology?
It would allow an aircraft to have a wingspan of >80 meters yet still be able to be serviced at a standard airport gate. 

There are a variety of benefits to longer wingspan, but the major drawback is that commercial passenger airports are designed around that 80 meter box.