Bangkok Airways Upgrades are always single-class, so you can move straight from economy to Business class, or even from Business to First Class. With flights operated by Bangkok Airways, you generally have permission to upgrade your economy seat to business class and your business class seat to first class. Bangkok Airways allows its passengers to upgrade their seats into business class as long as they are available within 24 hours of the scheduled departure, always subject to the availability of seats in the business class. These are the ways passengers can do an easy Bangkok Airways upgrade to business class online, to know the details visit the Bangkok Airways website or call a toll-free number to reach the representatives. Bangkok Airways Oslo Office provide customers the world-class services, Bangkok Airways offers on-departure seat upgrades from economy to business class and to first-class.