Once upon a time in my recruiter days I couldn't care less if people shopped around, We even encouraged it. Job fairs are supposed to answer questions too, facetime with a recruiter can tell you more than the internet can. We would tell candidates to go talk to everyone and see who you think you will fit in best with, come back if you think it's us. I wouldn't even get mad if people gave me a resume with another airlines name on it, i'd give them a hard time about it but mistakes happen and guaranteed they won't do it again. Granted, this was at the regional level but you can't put your eggs all in one basket and any decent recruiter should know that, a good candidate will be a good employee whereever they get hired. This "don't waste our time if you're gonna leave right away, only apply if you want to be here" is just an excuse to cover up lower pay or work rules IMO, seen it at a few shops.