The Flight Data API is a robust and comprehensive API that provides extensive flight insights, including flight price trends, popular airports, destinations, offers, and more. It supports various programming languages such as Python, PHP, Ruby, NodeJS, and Javascript, making it easy to integrate into applications. The API uses cached user searches in Aviasales.ru and Jetradar.com for the last 48 hours and is completely free. It has multiple endpoints that provide useful information, including flight price history, cheapest tickets, flight price trends, popular destinations, and more. The API also provides JSON files with data arrays, making it easy to retrieve data in a structured format.