Can I see which flights are selling out fast so I know which ones to push to my customers?

Not directly through the API itself, but you can track booking patterns over time to spot which flights are popular. The API will show you availability when your customers search, and if a flight goes from many seats available to just a few, that tells you demand is high. You would need to monitor these changes yourself by looking at your booking data and search results over days or weeks, rather than the API sending you alerts automatically.

Some portals build their own dashboards to watch which flights book quickly, which routes are trending, and which price points sell best. This helps you understand your market and guide customers towards flights that match what others are choosing. However, this depends on how much data history you keep and how you choose to analyse it, so the detail you can see varies.

What matters most is that when your customers search, they see real availability right now from the suppliers. You cannot sell something that has already gone, and the API protects against that by checking live before each booking. If you want to spot trends and popular routes, start by looking at which flights your own customers actually book over time, and use that to guide your marketing and recommendations.

Check with your portal provider about what reporting and analytics tools are built in to help you see which flights and routes are performing best for your business.