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I can see two reasons they would have added the CAPTCHAs to the page. First is traffic related: CAPTCHA's generally will block some spam bots from being able to repeatedly submit the form; repeatedly submitting the form can cause traffic spikes and generally slow down a website.
The second I would suspect would be to prevent someone from creating an application that would use the same type of tools as a spambot but would automate the process of checking for price drops by regularly hitting that form, parsing the HTML result table and returning it to the application hitting the form.
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So that's what those are called-CAPTCHAs; I've seen it on other sites but never on the fareviewer; does add a little more to the process of checking prices, but if it keeps the site from slowing down, that's a good thing.
I couldn't see the first code it was printed in light yellow so I had to click "see another code" or whatever the exact wording is. Actually had to do this a couple of times before I got a code I could read.