One phone call that lasted 30 minutes. Went over basic information on myself and the company. Didn't dive very deep. Heard back within a few weeks after with an offer.
I applied through an employee referral. The process took 2 months. I interviewed at RTX in Apr 2019
Interview
20 minute interviews with two different Managers on the phone after my application was accepted. About a month after my interview I got a call offering me the position. After accepting there were several more calls instructing me on further steps such as drug testing, background check, and placement.