Traditionally, many style guides define components as atomic components, which are then used to build more complex molecules. In theory, this works well to create coherent and flexible systems. In practice, however, what often happens is that these re-usable atoms are used many different ways, allowing all kinds of molecules to be created. Again, this opens the door for all kinds of disjointed experiences and makes the system harder to maintain.
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AAdvantage is the frequent flyer program for American Airlines. It was launched on May 1, 1981, and it remains the largest frequent flyer program with over 67 million members as of 2011. Miles accumulated in the program allow members to redeem tickets, upgrade service class, or obtain free or discounted car rentals, hotel stays, merchandise, or other products and services through partners. The most active members, based on the amount and price of travel booked, are designated AAdvantage Gold, AAdvantage Platinum, AAdvantage Platinum Pro, and AAdvantage Executive Platinum elite members, with privileges such as separate check-in, priority upgrade and standby processing, or free upgrades. They also receive similar privileges from AA's partner airlines, particularly those in oneworld.[48]
Flight Attendants at American wholly owned Regional Carriers (Envoy – former American Eagle), Piedmont and PSA are all represented by Association of Flight Attendants – Communications Workers of America (AFA-CWA). USAirways Flight Attendants were active members of AFA-CWA prior to the merger. They are honorary lifetime members. AFA-CWA is the largest Flight Attendant Union in the industry and is operated by Flight Attendants.
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Violations occurring over a 4½ year period—from October 1993 to July 1998—targeted American Airlines for using high-sulfur fuel in motor vehicles at 10 major airports around the country. Under the federal Clean Air Act high sulfur fuel cannot be used in motor vehicles. American Airlines promptly identified and corrected these violations of the Clean Air Act.[79]
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Not all components are created equal. In most apps there are a set of components that repeat often. For us, these components are rows (or table-cells). Looking back, I wish we had taken more time to think about the rows and come up with a stronger set of patterns and components. In the end, we wound up with many different kinds with some inconsistencies.
On June 3, 2016, American Airlines sought to register their 2013 logo with the United States Copyright Office.[65] However, in October of that year, the Copyright Office ruled that the logo was ineligible for copyright protection, as it did not pass the threshold of originality.[65] American submitted multiple requests for the Copyright Office to reconsider their determination. However, on January 8, 2018, the Copyright Office made a final decision that affirmed its initial determination that American's new logo was ineligible for copyright protection and is thus in the public domain.[65][66]

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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.
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