Aluminum bikes

I saw one of those fat tire bikes in the shop.

I was very surprised as to how light it was compared to my Huffy MB.

Was it made from aluminum?

On another topic about flat tire tips

I got a Microflate Nano tire inflator with a 20 gram cartridge.

I already had tire levers,spare tube and 15 mm wrench.

Have not had a flat in over 5 years.

What is the procedure for a rear tire flat?

Thanks,
Andy