OnNet USA has announced the closed beta test for its World War II flight combat MMO, Heroes in the Sky. Beta testing will run until September 20th, from 4-7 PM PST each day.

Heroes in the Sky has both single and multiplayer online worlds. Currently, players can choose from two historical maps -- Normandy and the Pacific -- and the game's "Dog Fighting" feature provides three different gameplay modes: Survival, Deathmatch and team Deathmatch.

Heroes in the Sky is free to play at Gamescampus.com, OnNet's gaming portal which was itself introduced in April of this year.

“We are extremely excited to bring Heroes in the Sky to our gamers. This game offers many hours worth of enjoyment as they fly their way through a variety of missions, “said Chris Keswani, team leader, Heroes in the Sky.