Julia_Sudnitskaya/iStock (NEW YORK) — As the Centers for Disease Control and Prevention released new outdoor mask guidance on Tuesday, many are looking to finally take the trips they missed out on last year due to the coronavirus pandemic. But before you book your next flight or change one, the Better Business Bureau is warning passengers to be careful about booking flights online. In a new announcement shared exclusively with ABC News’ Good Morning America Wednesday, the BBB is telling passengers to beware of dealing with a third party that charges extra fees instead of dealing with the airline directly.