Perhaps I never looked at the field because I normally book rooms for myself and the data auto-populates based on my profile, but as I was booking a room for a colleague, the following titles are available for selection, in the order of appearance:
FRAU
VICE PRES
SENIORITA
SENORA
SISTER
SIR
SIGNOR
SHEIKH
SERGEANT
SENATOR
SENOR
RABBI
REVEREND
PRINCESS
PRINCE
PASTOR
PROFESSOR
PRESIDENT
NURSE
MONSIEUR
MINISTER
MAJ GEN
MAJOR
MASTER
MADAME
LORD
LT GENERAL
LT CDR
LT COLONEL
LIEUTENANT
LADY
JUDGE
HONORABLE
HERR
GOVERNOR
GENERAL
FATHER
ESQUIRE
DEAN
CHEF
CJ
COMMANDER
COLONEL
CARDINAL
CEO
CAPTAIN
BISHOP
BRIG GEN
ATTORNEY
AMBASSADOR
ADMIRAL
REV
Mr. & Mrs.
Mr.
Mrs.
Ms.
Dr.