Suggestion for your site. I'd change the front page header text that says: "Discover cheap flights with Concorde."
It's not the text I disagree with it, it's how you're using it. You've made it so that you have to mouse over that text to make it react (segments change color) and figure out that each section may be clickable (how do I know where they go, if I'm an average user and don't necessarily know to look at the url hover at the bottom of the browser?).
Why is it an issue? It's extraordinarily bad usability, because there's nothing above the fold on your site that says: sign up. Not anywhere. There's a weird text in the upper right that says "Discover" that is changing colors, but gives no indication that it links to /sign-up. From a logical usability stand point, why would the "Discover" text be the /sign-up link, as opposed to just having a "Sign up | Login" segment.
You're trying too hard to be clever / creative, you're over-doing it and it's a bad usability outcome.
At the top, I'd keep the large text that is making a clear statement. Then place two or so lines of descriptive text below it, with blatant links to signing up etc. Or some variation on this. You have plenty of room to work with up in the header area.