Can we go to Mars in airplane

 Not with a normal airplane like a Boeing 747 or Airbus A320.

Airplanes work by using air:

wings generate lift from Earth’s atmosphere,

engines need oxygen from the air for combustion.

But Mars is about 225 million km away on average, and space between planets is essentially a vacuum with no breathable air. Mars itself also has a very thin atmosphere — far too thin for ordinary airplanes.

To reach Mars, you need a spacecraft launched by a rocket, such as:

SpaceX Starship

Orion

Interestingly, small aircraft can fly on Mars itself if specially designed. NASA’s Ingenuity successfully flew in the Martian atmosphere by using ultra-light construction and very fast rotor blades.

So:

Earth → Mars: rocket spacecraft required.

Flying around on Mars: possible with specially engineered aircraft/helicopters.