"With it being the end of the year, I imagine there were many people returning from joyful overseas trips. It is truly heartbreaking to see such a tragic incident occur," says office worker Jeon Chan Uk, a day after 179 people were killed when a Jeju Air plane crashed on arrival on Sunday. The accident is the worst aviation disaster on South Korean soil, as the country declared a seven-day national mourning period, with memorial altars to be set up nationwide. IMAGES AND SOUNDBITES