The air taxi start-up will collaborate with Southwest Airlines in California.Archer Aviation (ACHR 11.49%) has a deal with Southwest Airlines (LUV 1.33%) to develop air taxi networks in California.It is a big sign of confidence in the "flying car" start-up and investors are excited about the development, sending Archer shares up 11% as of 11:30 a.m. ET.Take an air taxi to the airport!Archer is one of several companies working to develop electric vertical takeoff and landing (eVTOL) aircraft for commercial u ...