RTX interview questions

Referred by a friend that works here, which immediately set me up for an in-person interview. Was interviewed in a 'batch', where they bring in a bunch of other people that were referred, around 30, and led us to a room. Inside, it was set up sort of 'career fair' style, with different departments(hardware, software, systems, etc.) stationed at their own booths. Half of the group was led on a tour, while the rest roamed around talking to different departments, then switched. Everybody there was really nice and welcoming, and there is a good mix of personable and technically inclined people.

Phone interview with HR, phone interview with project manager. The HR person was very nice and responsive, but then suddenly they just completely stopped responding to me. Never heard back from them even when I was asking if I was still being considered. It was extremely frustrating.