Sri Hanuman flies

About to fly, Sri Hanuma jolted his tail, just as Garuda, the king of birds would jolt a snake.  Sri Hanuma firmly supported his arms (on the mountain surface), which resembled huge iron clubs, crouched the waist and contracted his feet and before flying spoke these words to the Vaanaraas.

"I will go to the city of Lanka, just like an arrow released by Sri Rama will go, with wind-like speed. If I do not see Seeta there, I will go with the same speed to the abode of gods.”

” If I do not see Seetha there in heaven, I will get Ravana the king of raakshasaas tied up in chains without any effort. I will, in all events, return successfully along with Seetha or I will get Lanka along with Ravana after uprooting it."

Sri Hanuma, spoke in this way to Vaanaraas and then without thinking about anything else, flew up with lot of vigor.

The sea-god, Saagara saw Sri Hanuma flying over him.  While searching for the ritual horse, the 60,000 sons of Sagara, king of Ikshvaaku dynasty, dug up the entire Earth and thus, developed the ocean.  Sri Hanuma is going to Lanka on a work of a descendant of that dynasty and Saagara thought he should not become tired.

Then, he told Minaaka, the hill with wings, hidden within him to rise and give hospitality to Sri Hanuma so that he can take rest on Minaaka and then traverse rest of the distance.  Accordingly, Minaaka rose suddenly from the sea.

Sri Hanuma on seeing the mountain, which stood before Him, decided that it as an obstacle.  Sri Hanuma pushed that great tall mountain with his chest just as the God of wind would do a cloud.  Minaaka, thus being fell down by that Sri Hanuma, recognized Sri Hanuma's speed and lauded him with pleasure.

When a service is done, a return service needs to be rendered. This is an ancient tradition. Hence, Saagara, who wants to do a return service to the Ikshvaaku dynasty, wanted to offer hospitality to Sri Rama through Sri Hanuma. 

Sage Valmiki conveyed this message through Sri Ramayana.