Tracked live by the FAA, but its flight plan was first seen after takeoff, so we don't know the scheduled time and can't say whether it's late.

ZIPAIR · FLIGHT ZG 15 IN THE AIR (OFF 1:07 PM CT, ETA 4:43 PM JST) · SCHEDULED TIME UNKNOWN
Today

ZG 15 · IAH → NRT

took off 1:07 PM CT · expected to land 4:43 PM JST (scheduled time unknown)
Forecast issued Tue 7:00 PM ET · 5h after departure

Odds over time

Arrive at NRT more than 15 minutes late?
26% chance · ±2 pts – · 24h
HOW SURE WE ARE Very high. The odds now come almost entirely from live conditions.
LIVE IN THE AIR 0% 10% 20% 30% 40% 1h Departs Now Lands