To build a good search engine like that costs more than 120k. It's alot of work, with web design the cost is based on the amount of work, that's what I feel is the amount I want in order to build the site. I think that is fair.
If most of the cost is hiring a web developer, take one in as a partner. If most of the cost is paying yourself, you shouldn't have to pay yourself much (if at all) if your goal is to create a profitable business. Why do you expect that people will comfortably fund your endeavor to make more money for yourself, especially without solid support for your costs? Where is your sacrifice? Is all they get out of it membership?
Also, have you factored in the legal issues of starting this site? The airlines definitely won't be supportive of it, and you very well might end up Skiplagged #2 and have to start a new kickstarter to fund your legal fees.