Refuelling an airplane involves putting fuel into tanks which are "empty" but are in fact full of dangerous air-fuel vapors. I do not believe many airplanes use "bladder" type flexible tanks which would avoid the creation of these airspaces.
When fuel goes in, the vapor has to go somewhere else. In contemporary cars, there is a vapor recovery both in the fuel system (activated carbon cylinder) as well as in the fuel nozzles.
If I understand both pressure refuelling as well as regular refuelling systems for airplanes and airliners, neither seem to have any sort of vapor recovery system. Wouldn't this be a considerable source of greenhouse gas emissions, let alone a tremendous fire hazard? Or is there a vapor recovery system being designed or implemented to mitigate this.