Are there any special requirements to utilize the 144 hours Chinese Transit Visa?

I will be traveling to Beijing, China in January for 3 days. I did verify here that I qualify for the 72/144 hour visa free entry into China as a US Citizen.

Do I need to do anything before I leave for China? I'm reading mixed information from various forums and sites. Some say I need to contact the Chinese Embassy and to contact the airline.

This article for example:

To obtain a transit visa exemption, travelers should review eligibility requirements, and confirm their eligibility with their local Chinese embassy. After confirmation, travelers must communicate their intention to obtain a transit visa exemption to their airline prior to travel. The airline will liaise with border control officials, who grant transit visa exemptions to travelers that meet requirements after verification.

So, does this mean I really need to contact the embassy and the airline?

My ticket is a one way ticket from DFW to PEK (American Airlines). I have another ticket (booked through Chinese Eastern Airlines) to CNX (Chiang Mai) from Beijing.

So, I'm a bit confused on the process and if I even need to do anything, or if I can just show up, go through a queue and be on my merry way.

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How do I get a 144 hour visa for China?

Condition

Be a citizen of one of the 53 countries qualified by the provisions and hold valid international travel documents that identify their nationality;

Hold a ticket for a connection to a third country (or region) that will leave within 144 hours of the passenger's arrival.

Can you transit through China without a visa?

Under the 24-hour visa-free transit rule, no visa is required for international flight, ship, or train passengers who transit directly through mainland China and will stay for less than 24 hours. Passengers should hold tickets to a third country or region and have a confirmed seat.

Does China allow transit?

24 hour visa-free transitForeign citizens travelling to a third country or region through China by plane, ship or train may stay up to 24 hours in China without a visa. The application for a preliminary entry permit at the Chinese border is a requirement for the visa-free entry.

How do I get a transit visa for China?

Chinese Transit (G) Visa A Chinese transit visa is valid for 7 days. To apply you would send your passport, a passport photo, visa application and a copy of your itinerary indicating the dates of transit through China. A Chinese tourist visa is typically issued for 6 months validity with a stay of 30 days.

Transit visa china EXPLAINED properly! 24, 72 and 144 hour visa free | Air china, Shanghai airport

Sources: Stack Exchange - This article follows the attribution requirements of Stack Exchange and is licensed under CC BY-SA 3.0.

Images: Angela Roma, Charlotte May, ROMAN ODINTSOV, Eric