A fantasy video showing a gigantic flying hotel that can stay in the sky for years on end has caused a sensation online, despite being beyond the realms of current technology and in breach of the laws of physics.

Nevertheless, Yemeni engineer Hashem Al-Ghaili, who created the Sky Cruise concept video based on a futuristic design by artist Alexander Tujicov, insists it's only a matter of time before aviation engineering catches up to his vision.

And, he says, his outlandish concept will help push the boundaries of what is possible.

Al Ghaili told CNN he wants Sky Cruise to be a talking point to inspire new innovations that will help replace the tiresome and outdated experience of flying today.

Hence, I imagined a world where flying from one place to another turned into a joyous experience, rather than fighting for leg space, he said via email.

'Castle in the Sky'

Al Ghaili says he took his own inspiration from one of his favorite movies, Studio Ghibli's Castle in the Sky anime, which features massive flying ships with people living inside.

Just like those ships, Sky Cruise is on an enormous scale, with room for around 5,000 guests, and recreational facilities like cinemas, swimming pools, spas and even shopping malls.

Sky Cruise would run on clean nuclear fusion energy -- technology that does not currently exist -- which would allow it to remain above the clouds for several years, Al Ghaili says.

Supplies and guests would be brought to the hotel using electric commercial airliners and private jets, he adds.

Turning this concept into reality is only a matter of time according to the engineer. However, due to its sheer size, it would need new infrastructure, and adjustments from the aviation industry.

The Sky Cruise is super massive! he says. This means it will need a huge runway that doesn't exist now.

'Disruptive concepts'

Not only that, but it would also require changes to air navigation protocols to ensure that other sky traffic navigates out of its way.

Not everyone shares Al Ghaili's confidence in the potential of the extraordinary design, with several among his 30 million followers on Facebook pointing out Sky Cruise's fundamental design flaws.

Nuclear powered or not, gravity is never letting that thing get off the ground, wrote one. Some questioned the wisdom of sending a nuclear reactor into the air, while another pointed out a very simple problem: keeping water in the swimming pool during takeoff.

Al Ghaili insists that his video, viewed 9.3 million times on Facebook, has a purpose beyond viral entertainment.

Disruptive concepts like this one inspire change, and help us push humanity forward, he says.