He said interview, not a trip.
I did it once. I was invited to interview with a regional. Lateral move to leave a shaky regional to another regional that is now (two years later) even more shaky, as well as a miserable commute. A slightly better deal came along, and I didn't want to commit the time and money to travel to the first interview. So I called and asked to reschedule sometime in the near future. The second deal worked out and I never bothered to call them back. A few weeks later, I got a call from somebody in recruiting asking what the story was. So I sent them a cordial letter, thanking them for the interest, and that I was still interested however my "personal situation" was such that I could not start a new job at that time. I imagine my info was round-filed by that point, and if I decided to pursue it after all, I'd be starting from scratch.
On another note, I did get terribly ill shortly before the interview with the "slightly better deal". Real bad sinus cold, a "blow my nose and get dizzy" kind of cold. I strongly considered calling in sick for real for that one, but decided to tough it out. Went to the interview, got the job, and here I am. Ironically, right about that time, another long awaited opportunity became available. If I had called off for that interview, I'd have probably flowed over to MDA instead, as that came up very quickly and soon after my interview. And if I had done that, I'd be sitting at the very dead bottom(as a J4J pilot) of the same list I am now almost halfway up (as a nobody starting over the hard way). But of course, with the recent news from USAirways, that might not have been quite so bad. You just can't tell, ask me in 30 years if I made the right call.
I was placed in the odd situation of having to juggle more than one opportunity, with a tough call to make. Seniority is everything, in more ways than one. Get on a list somewhere as quickly as possible, and with any luck, it just might work out to be the right list.