Booking Classes listed below earn less than 100% of actual miles flown in Economy Class, less than 125% in Business Class, or are not eligible for mileage accrual. If your ticketed booking class is not included in this chart, for example Y,B,M in Economy Class, then you will earn full mileage according to the class of service flown. Royal Orchid Plus miles are earned according to booking class codes of the operating Star Alliance airline. on THAI and Star Alliance airlines the following booking classes are not eligible for mileage accrual O/ I/ X/ R/ N When purchasing a marketing ticket, these tickets display the carrier code followed by a 4 digit codeshare flight number, and can be purchased from the marketing carrier, travel website or a travel agent. An eligible booking class for mileage accrual on a codeshare ticket issued by the marketing airline may NOT be eligible for accrual by Royal Orchid Plus members if the flight is operated by another Star Alliance carrier, particularly on discounted Economy Class fares. The chart below displays these exceptions for codeshare flights between THAI and Star Alliance airlines. If miles are important to you when flying on codeshare flights among Star Alliance airlines, it is advisable to purchase the ticket from the operating airline when possible, or purchase a fare that is not discounted. The booking classes on the chart below are an indication of discounted fares among Star Alliance airlines. Please note that mileage accrual and booking class eligibility with THAI and/or Star Alliance airlines are determined by each carrier and are subject to change without prior notice.