sentences:  On September 27, 2010, after the airline cancelled more than 50% of its flights scheduled for the day, the National Civil Aviation Agency of Brazil (ANAC) ordered the suspension of ticket sales for 5 days to investigate reasons.After this period, sales and operations resumed as scheduled.Although in Brazil Webjet informally used the prefix WJ for its flight numbers, officially it had been assigned by IATA the code WH.