I suppose this doesn't sound exactly like a "US" start up but they are starting a US base. What airline are they talking about...Norwegian ? I can't keep track of what they're doing:
“First 2 Resource is seeking EASA Licensed B737 Captains & First Officers for our
newly established European Client for their Base in Miami for a 6month renewable contract.”
https://www.latestpilotjobs.com/jobs/view/id/14244.html