Not everyone can afford to get near an edru. Only the rich can have that luxury of traveling and of going somewhere. When one boards an edru, it entails money on the part of the traveler. What is an edru? It's the Waray word for AIRPLANE.
Edru involves flying; yatot, crawling. While the rich can afford to fly, one crawls when he/she is as poor as a rat. Well, figuratively. What is yatot? That's RAT in Waray.