As Happy as a __; Filthy Porcine
This page is the CodyCross answer for the clue below from Airport, Group 460, Puzzle 4 (Aircraft Operations).
Question is: As Happy as a __; Filthy Porcine
and the answer is: PIGINMUD
Word Meaning:
PIG — (countable) Any of several mammalian species of the family Suidae, having cloven hooves, bristles and a snout adapted for digging; especially the domesticated animal Sus domesticus.
Definitions from Wiktionary.