Sometimes airlines can make schedule changes between the time of booking and the time of departure. It is always recommended to re-confirm your flight at least 24 hours prior to travel. You can view all of your flight information at www.checkmytrip.com - you will need to enter your airline booking number (PNR) in the booking reference field and your last name as well as your first and middle name (together with no space in the first name field). You can find your PNR in the flight information portion of your portal. in some cases you flight may indicate a specific airline and then say "operated by" another airline (example a Delta Airlines flight operated by Air France). This is because airlines have agreements called "Codeshares" for specific routes. It allows them to sell a ticket on that route and have the passenger travel with a partner airline.
NOTE: for travelers on Aer Lingus airlines. Not all Aer Lingus flights are on checkmytrip.com. You will need to visit the Aer Lingus website directly www.aerlingus.com