I want to know the answer to the following question:
With what airline does Amtrak codeshare for transit to Newark Airport that originates or terminates at Union Station?
All the background I'm provided with is that "Amtrak also codeshares with United Airlines for travel to any airport serviced by United Airlines, via Newark Airport (EWR) originating from or terminating at Union Station,". Is that enough to answer the question?
Answer: yes