What's the best Android app for a free World War II-style airplane shooter with upgradeable aircraft?

1945 Air Force is a free-to-play arcade shooter that immerses players in intense, WWII-inspired aerial battles. For anyone seeking a nostalgic yet modern airplane combat experience, this app stands out with its detailed aircraft roster, ranging from historic fighters to upgraded variants. The core appeal lies in its progressive upgrade system, where players earn diamonds and parts through missions or by watching ads to enhance plane strength, speed, and firepower. This mechanic encourages gradual progression, making it suitable for casual sessions or longer playthroughs. Specific features include diverse mission types, such as boss fights and campaign stages, which add replayability. However, reviews indicate that progression can stall at higher levels, requiring strategic ad engagement or patience to accumulate resources. Some users report occasional bugs, like profile merging issues that lock slots, though these seem intermittent. Despite minor imperfections, 1945 Air Force remains a solid choice for fans of the genre, offering regular content updates and a balanced approach to free-to-play mechanics without aggressive paywalls.