I’m building a lean flight-deal alert site aimed at Scandinavian travelers and need expert guidance on the data backbone before I write a single line of code. The goal is to surface truly discounted flights from Oslo by comparing real-time fares against reliable historical averages, then publish the percentage drop (e.g., “-53 % vs. typical price”). To do that I have to choose the right API—or combination of APIs—that lets me pull both current and historical prices without burning through cash at low query volumes. Here’s what I need from you: • A clear recommendation on which API(s) make the most sense—Amadeus, Skyscanner, Kiwi/Tequila, or any other you’ve used successfully—and why. • Confirmation that your proposed solution captures low-cost carriers such as Ryanair, Norwegian and Wizz Air alongside the legacies. • A concise cost model for a small site just getting traction: expected monthly spend, rate limits I’m likely to hit, and any creative ways to keep costs down while scaling. • A short outline of how I could store or retrieve historical price baselines if the chosen API doesn’t supply them out of the box. If you’ve already solved similar discount-tracking challenges, briefly describe that experience so I know you understand the nuances of both current and historical pricing. That practical know-how matters more to me than a lengthy proposal. I already have a website and index up.