停飞的理由是，这种飞机会造成严重的噪音污染。

The reason for grounding the aircraft is that this type of plane causes severe noise pollution.

战斗机因系统故障而无限期停飞。

The fighter plane has been grounded indefinitely due to a system failure.

受到罚款、停飞等处罚

given a fine, suspension from flying, and other punishments

飞行员停飞两三年，必然影响飞行事业。

Being suspended from flying for two or three years will inevitably affect a pilot's career.