"Thank you for the  badge , I can now say good morning !," Borschbergm tweeted.

The aircraft will be in Cairo for 15 days before its final stop is Abu Dhabi, where the challenged began in March 2015.

The adventure is to encourage people to promote clean and renewable energies.

Andre Borschbergm hailed Cairo's appreciation of renewable energies.

Solar Impulse 2 has a wingspan of 72 meters, 12 meters longer than that of Boeing 747, but weighs only 2.3 ton. Equipped with 17,248 solar cells, the zero-fuel plane runs on stored energy at night.