According to Abu Hanifa, founder of the Hanafi schools jurisprudence of Sunnism, the jinn might enter jannah, but, just like angels, they will receive no reward. Impossibility to enter jannah only applies to the devils (shayatin).

Can a jinn be an angel?

as the opposite of al-Ins (something in shape) referring to any object that cannot be detected by human sensory organs, including angels, devils and the interior of human beings. Accordingly, every devil and every angel is also a jinn, but not every jinn is an angel or a devil.

Who goes straight to Jannah?

Many Muslims believe that those who give up their lives while defending Islam or because they have refused to deny their faith become martyrs . Such people, it is believed, will go straight to Jannah.