lankam ayus ca kalpantam
yayau cirna-vratah purim
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
After giving Vibhisana the power to rule the Raksasa population of Lanka for the duration of one kalpa, Lord Ramacandra, the Supreme Personality of Godhead [Bhagavan], placed Sitadevi on an airplane decorated with flowers and then got on the plane Himself. The period for His living in the forest having ended, the Lord returned to Ayodhya, accompanied by Hanuman, Sugriva and His brother Laksmana.