Alva Review-Courier -

A helicopter trip to a hospital may not be the only shock a patient faces after a bad accident. The next one could hit when the bill arrives.

Rides in so-called air ambulances can lead to bills of more than $20,000 depending on a person's coverage, and insurance experts say big invoices are becoming more common as costs rise and coverage shifts.

Air ambulances transport around 400,000 people each year in the U.S., according to industry estimates. Most trips are from one hospital to another. But they also play a vital role in getting seriously injured or ill people fast help during what doctors...