The badge is definitely an Eagle. The RAF Website mentions the following (which could account for the albatross confusion):
'The original designer of the Royal Air Force badge is not known, but it has been suggested that he was a tailor at Gieves Ltd (Tailors) and the bird he drew was an albatross. At an Air Council meeting in December 1922, decreed the badge as worn on the head dress which did not include a garter and buckle but just the crown and eagle with circlet was to be used at all times. In January 1923, the new badge was submitted to the College of Arms for registration, the covering letter stating the design received the approval of the King simultaneously with other details of the Royal Air Force uniform.'