Hi mommy! Honestly, hindi ko sure kung may specific flight permit from OB kailangan, pero usually ang airlines lang ang may requirements, like medical clearance form mula sa doctor mo if you're late in pregnancy, depending on how far along you are at flight date. I'd suggest mag-contact ka directly sa airline you're flying with para sure, at pati tanungin ang OB mo on your next visit kung may kailangan really para safe, better to be certain na, lalo na pagbuntis!