I thought if an object had no contact with earth could not get electricuted or is it different.
It depends. In order for current to flow, there has to be voltage potential present. Lightening strikes because there is a potenital difference between the charged particles within the cloud and the ground.
Think of birds standing on high voltage cables. They aren't electricuted because their body is a fairly poor conductor. The electrons gain nothing from taking a detour though their body, they will follow the easiest path (the path of least resistance). If the bird were to stretch it's wing out and touch another wire of different potential, and there is sufficient current to overcome it's resistance (likely in high voltage cables) then it will fry!
An aircraft will behave like a
Faraday Cage, causing the induced current to flow through the airframe and not it's occupants.