Jetstar Japan's first aircraft, an Airbus A320, landed at Tokyo's Narita airport on 26 April.
The IAE V2500 powered aircraft will undergo a series of proving flights in May as part of its final regulatory approval process, says the airline.
"This is a very exciting milestone for Jetstar Japan and brings us another step closer to connecting people through greater choice, lower fares and more travel options," says its chief executive Miyuki Suzuki.
Jetstar Japan plans to begin domestic operations from July 2012 and plans to expand internationally in 2013, subject to regulatory approval. It will start with a fleet of three A320s before growing to 24 aircraft in the coming years.