For rather obvious reasons (one should hope!), question titles need to be understandable, reasonably complete and provide at least minimum context. Unfortunately, there are some which are hard to comprehend what they are really about without reading them in their entirety. This is also often a symptom of bad questions -- if the post can't be summarized in a sentence, it's probably not a real question or it's too broad. Question titles need not be short -- there's no maximum limit (that I know of), so a sentence or even two are completely acceptable. We don't charge by the character here :-)
Case in point: I challenge you to explain what the following question is about without reading it:
Is it about defining what travel companion programs are? Or perhaps where to find one? Or a particular issue with a certain program? Impossible to tell without reading further, which defeats the idea of having titles in the first place.
Here's a counter-example of a great question title:
Can you understand what's going on there without reading further? Most certainly.
So I implore you, fellow Travel-SE users, try and formulate meaningful question titles (with verbs, predicates and a question mark to boot) when you edit, retag, answer, or just look at a question. Make it sound like a question. An added benefit is better relevance when the topic is searched for -- it's no secret that the majority of traffic for SE sites comes from search engines.
I'm almost certain there's been SE blog posts or MSO discussions on question titles; if someone finds them, please add a link.