US aviation regulators proposed standards for an air taxi made by Joby Aviation Inc., paving the way for the first official certification of the novel electric aircraft.

The Federal Aviation Administration on Monday revealed “airworthiness criteria” for Joby’s JAS4-1, a four-passenger craft designed to lift off like a helicopter and then fly horizontally like a plane. The action, which gives the public and industry 30 days to comment, lays out the steps Joby would take to get agency approval.

The announcement is a significant milestone for Joby and could become a template for other air-taxi manufacturers trying to create a new form of urban transportation. Multiple hurdles remain before Joby can begin carrying passengers for hire as it attempts to become an airline and the government creates new regulations to oversee such operations.