I've worked for and know many people that work for very large (F500ish) companies, as well as the large consulting companies (Deloitte, Pwc, Accenture, etc), an

I've worked for and know many people that work for very large (F500ish) companies, as well as the large consulting companies (Deloitte, Pwc, Accenture, etc), and booking your own flights/hotel is standard practice at all of the consulting companies and most of the others.