Pros
Colleagues are all interesting people with interesting backgrounds - you're not bored by your coworkers, pretty good healthcare (United), they handled the pandemic well in my opinion, 9/80 schedule (every other Friday off), mod time or paid overtime for exempt employees (depending where you work), good opportunities to network in very active Employee Resource Groups
Kontras
Pay not as competitive as other defense contractors, large company makes things like promotions more formalized and so promotions are not given out when merited but more when expected (promoted only after X number years in position, not based on how you performed in the position), not a ton of room for negotiating annual raises (in my section, might be different in others), a lot of position openings are already filled when they are posted b/c the hiring system is based a lot on who you know. Despite the cons, I've still enjoyed working at RTX and did not leave for my new position in another company with any bad feelings.