"Ezek a repülőgépek mindenfelé repülnek: Párizsba, Bécsbe, Tokióba."
Translation:These planes fly in all directions: to Paris, to Vienna, to Tokyo.
You don't fly "into" a direction - you fly "in" the direction of ...
A plane may "fly in all directions" but it may not "fly into all directions"
If directions were tangible it would be different.
E.g. "That plane flew into Sydney yesterday" - but then it would be advisable to use "to" instead - "That plane flew to Sydney yesterday"