Valmiki Ramayana 7.23.10
ततः पितामहस्तत्र त्रैलोक्यगतिरव्ययः ।आजगाम द्रुतं देवो विमानवरमास्थितः॥
tataḥ pitāmahastatra trailokyagatiravyayaḥ |ājagāma drutaṃ devo vimānavaramāsthitaḥ ||
Our plain-language meaning of this verse is waiting for scholar review.
Open in the book