Dear Sir/Madam, I hope this message finds you well. I am planning to book a flight from Sofia, Bulgaria, to Bucharest, Romania, with a layover at Athens International Airport (ATH). I hold a valid Schengen visa issued by Bulgaria. I would like to confirm whether I can transit through Athens without any issues, considering my visa was issued by Bulgaria. The layover duration is approximately 2 hours, and I will remain within the international transit area without exiting the airport. Could you please confirm if this is permissible, or if there are additional requirements I should be aware of? Thank you in advance for your assistance.