For ground transportation, ride$-$sharing programs such as Uber are gaining popularity. Several companies, such as OpenAirplane, DiamondShare, AirPower, Flytenow and SkyPool were formed to offer similar air transp transportation programs using privately owned, non$-$commercially operated aircraft on an expense$-$sharing basis under $14$ CFR $61\mathrm{.}113($b$).$ Determine the FAA's present position on the legality of such operations and the reasoning behind that position, and then evaluate its reasonableness.