Business casual may be acceptable in some cases, but people normally wear business formal (suit and tie for males for example).
Pace of work is always fast but not necessarily right. Company tries to invest in a lot of pilots until they get it right.
This will depend on the position you are applying for. Each manager has their own method of interview and reasons for asking certain questions.
We work together as a team and ensure that our clients are supported as per requested with accuracy to sometimes, very difficult questions.