Instead of relying on individual atoms, we started considering our components as elements of a living organism. They have a function and personality, are defined by a set of properties, can co-exists with others and can evolve independently. A unified design language should not just be a set of static rules and individual atoms, but an evolving ecosystem.
Some cities have restrictions on subletting for a short period of time. Airbnb has published a list of regulations and requirements for cities in the United States. In some cities, collection of a transient occupancy tax by Airbnb is required. In many cities, hosts must register with the government and obtain a permit or license.[9] Landlords or community associations may have restrictions on short-term sublets.
American Airlines' wastewater treatment plant recycles water used at the base to wash aircraft, process rinse water tanks, and irrigate landscape. That alone has saved almost $1 million since 2002. In addition to that, American Airlines has also won the award for the reduction of hazardous waste that saved them $229,000 after a $2,000 investment. A bar code system is used to track hazardous waste. It has led to reduction of waste by 50 percent since 2000.[80]

On January 17, 2013, American unveiled a new livery.[68] Before then, American had been the only major U.S. airline to leave most of its aircraft surfaces unpainted. This was because C. R. Smith hated painted aircraft, and refused to use any liveries that involved painting the entire plane. Robert "Bob" Crandall later justified the distinctive natural metal finish by noting that less paint reduced the aircraft's weight, thus saving on fuel costs.[69]
To help fund the site, the founders created special edition breakfast cereals, with presidential candidates Barack Obama and John McCain as the inspiration for "Obama O's" and "Cap'n McCains".[25] In two months, 800 boxes of cereal were sold at $40 each, which generated more than $30,000 for the company's incubation.[26][27] It also got the company noticed by computer programmer Paul Graham, who invited the founders to the January 2009 winter training session of his startup incubator, Y Combinator, which provided them with training and $20,000 in funding in exchange for a small interest in the company.[18][28][29] With the website already built, they used the $20,000 Y-Combinator investment to fly to New York City to meet users and promote the site.[30] They returned to San Francisco with a profitable business model to present to West Coast investors. By March 2009, the site had 10,000 users and 2,500 listings.[29]
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