During my internship as a data analyst at Amadeus, I developed a forecasting project for Air GDS bookings time-series. GDS (Global Distribution System) is a digital system enabling flight tickets bookings for travel agencies. The main aspects of the project are the high number of time-series to analyse and forecast and the huge impact that Covid pandemic had on data. After analysing data, I applied two different models, one requiring more expertise in time-series modeling, and the second one accessible also to analysts with less mathematical and statistical background: SARIMAX and Prophet. SARIMAX is a statistic regression model with residuals modeled as Seasonal ARIMA time-series.