Boeing ASIC Design Engineer interview questions

I got an email inviting for an in-person interview. I went to the location, standards setting, two interviewers, standard behavioral questions, questions about some of the projects I had worked on, and a few technical questions. After the interview, they said they will let me know of the results. I send a follow-up email to the recruiter who set up the interview afterwards for a thank you note, received no response. I send two follow-up email 1 and 2 weeks after the interview, still no response. I was extremely disappointed by how unprofessional they were. I was able to message one of the interviewers on LinkedIn and he told me that I wasn't selected by the position.