Valmiki Ramayana Yuddha Kanda Sarga 130 Shloka 37

ततः then, अनुत्तमम् excellent, हंसयुक्तम् with pictures of swan, महावेगम् high speed, तत् that विमानम् aerial car, रामाभ्यनुज्ञातम् Rama's permission, महीतले on the ground, निपपात came down

Then that excellent Pushpaka which had pictures of swans on it came down to the ground with Rama's permission.