As a physician and government traveler, the online booking service never asks for my title, and even if it did, I'd have to choose: Dr/MD? LCDR/USN/MC? Most identities online don't require a title and I don't offer. It only induces spam.
Just as an entertaining aside - the British Airways registration page currently includes Viscountess amongst other titles. Even so it's relatively limited - in its early days it contained a bizarre list of titles including the, um, uniquely prestigious "pope". Presumably the result of over-enthusiastic data population of the DB from some authoritative resource.
