Compass airlines with bases in SEA MSP and LAX, operating 65 ERJ 175 aircraft have at least 10 captains that upgraded at 23 years old and are flying the line with 21 year old restricted ATP holders in the right seat. They continue to upgrade pilots that have the required 2,500 hours total with at least 1,000 hours FAR part 121 time. More and more 21 year olds are getting hired at 1,000 hours total at this airline, and making it to the left seat in less than two years on the job.