Also don't assume people can't have the same first and last name (Norwegian Air...). When their website failed to book my ticket, a customer rep told me to put NAMEMR as my first name. This then led to my ticket showing NAME MR MR. Surprisingly nobody batted an eye on international travel day, but it annoys me that their website product team decided to take it on themselves to take what I assume were Norwegian naming norms and improve on lax GDS constraints.