The airline reservation number is located under the "Basic Info" on your e-Ticket Receipt which can be downloaded on your MY BOOKING page.
To download your e-Ticket Receipt, please follow below steps.
1.Go to the MY BOOKING page and log in with your DeNA TRAVEL itinerary number and e-mail address.
2. Find the "MY BOOKING MENU" on the left side and click "e-Ticket Receipt" in the MY BOOKING MENU.
3.Please read CONDITIONS OF CONTRACT AND OTHER IMPORTANT NOTICES and check the agreement box then click the "e-Ticket Receipt button" in yellow.(after clicking the E-ticket will be downloaded)
4.Open the file and find your Airline Reservation Number under the "Basic Info"