Also I work for a major airline and can get anywhere and would like to expand this idea to other states one day.

You can't do this anymore but you used to be able to get cold hard cash in the form of dollar coins shipped from the US Mint paid for with a credit card with no fees, free shipping no less.I, um, heard this was a great way to reach minimum spend for signup bonus airline miles

Can I place a smart tag on a vacuum cleaner that's kept in an apartment building's 1st floor laundry room, allow tenants on the 1st and 2nd floors to borrow it, then accurately bill them per hour?

Carpet in your condition is usually steam cleaned not vacuumed.

Has anyone used robot vacuums for cleaning rental properties when turning units over? 

This stuff, when removed (disturbed) has to be removed with HEPA vacuum as it is peeled away and PPE.

Consider the following example: In the 1950’s the major commercial airlines got together at a conference in Poland to devise a uniform safety procedure.

The writing is on the wall, it's just a matter of time they will move out completely. when that happens, it will leave a big vacuum in the local economy.

They never heard of a product called windex or a vacuum cleaner .

Open up a gas credit card and Southwest airlines credit.