Question: What are both Westair de Mexico and FedEx Express?
Context: Westair de México S.A de C.V. was a Mexican airline that operated cargo flights on behalf of FedEx Express. David J. Bronczek is the current President and COO of FedEx Corporation.  He began working at FedEx in 1976 as a courier, and held top jobs in Canada and Europe before returning to headquarters in Memphis in early 1998 to become the executive vice president and chief operating officer.  In October 1999 he was selected to become the president and chief executive of FedEx Express, one of the three operating companies in the Federal Express Corporation, as of January 2000. FedEx Corporation is an American multinational courier delivery services company headquartered in Memphis, Tennessee.  The name "FedEx" is a syllabic abbreviation of the name of the company's original air division, Federal Express (now FedEx Express), which was used from 1973 until 2000.  The company is known for its overnight shipping service, but also for pioneering a system that could track packages and provide real-time updates on package location (to help in finding lost packages), a feature that has now been implemented by most other carrier services. FedEx Office Print & Ship Services Inc. (doing business as FedEx Office; formerly FedEx Kinko's, and earlier simply Kinko's) is an American retail chain that provides an outlet for FedEx Express and FedEx Ground (including Home Delivery) shipping, as well as printing, copying, and binding services.  Unlike its main competitor, The UPS Store, all FedEx Office stores are corporate-owned. Roberto Hernández Ramírez (born 1942 in Tuxpan, Veracruz) is a Mexican businessman.  He is a former CEO of "Banco Nacional de México (Banamex)", Mexico's second largest bank, just after BBVA Bancomer, from Spain.  He is currently a member of the administration board of Citigroup.  Chairman of the Board, Banco Nacional de Mexico, S.A. - 1991 to present; Chief Executive Officer, Banco Nacional de Mexico, S.A. - 1997 to 2001; Director, Grupo Financiero Banamex, S.A. de C.V. - 1991 to present; Co-founder, Acciones y Valores Banamex, S.A. de C.V., Chairman -1971 to 2003; Chairman of the Board, Bolsa Mexicana de Valores, S.A. de C.V. (Mexican Stock Exchange) - 1974 to 1979, Director - 1972 to 2003; Member of the International Advisory Committee of the Federal Reserve Bank of New York - 2002 to present; Chairman, Asociacion Mexicana de Bancos (Mexican Bankers Association) - 1993 to 1994; Member, Bolsa Mexicana de Valores, S.A. de C.V. - 1967 to 1986; Director of Citigroup since from 2001 to 2009; Other Directorships: GRUMA, S.A. de C.V. and Grupo Televisa, S.A.; FedEx Express, formerly Federal Express, is a cargo airline based in Memphis, Tennessee, United States.  It is the world's largest airline in terms of freight tons flown and the world's fourth largest in terms of fleet size.  It is a subsidiary of FedEx Corporation, delivering packages and freight to more than 375 destinations in nearly every country each day. Plaza de Mexico, also known simply as Plaza Mexico, is a historic riverside square in Manila, Philippines, located at the west end of Magallanes Drive and Riverside Drive in Intramuros bordering the Pasig River in the north.  It is surrounded by the Aduana Building on the south, the Bureau of Immigration Building on the east and the ruins of the "Bastión de Maestranza" and "Puerta de Almacenes" on the west.  The Pasig River Ferry has a station also named "Plaza Mexico" located northeast of the square behind the Immigration building.  The square was named Plaza de Mexico in 1964 to commemorate the 4th centenary of the expedition of Miguel López de Legazpi and Andres de Urdaneta from New Spain (Mexico) and the historic Manila-Acapulco galleon trade relations between the two nations that lasted 250 years. The Revista de la Sociedad Química de Mexico or Journal of the Mexican Chemical Society (ISSN 0583-7693  , CODEN RSQMAN), usually abbreviated "Rev. Soc.  Quím.  Mexico" or "J. Mex.  Chem.  Soc."  is a Mexican scientific journal in chemistry.  It was founded in 1957 by the Mexican Chemical Society ("Sociedad Química de Mexico").  As of June 2014, the full text of the journal is freely available online on its homepage. Aerovias Guest S.A. was Mexico's third airline founded after Mexicana de Aviación and Aeronaves de Mexico.  It was later taken over by Aeronaves de Mexico when it declared bankruptcy. Mountain Air Cargo (MAC) is an American cargo airline based in Denver, North Carolina.  It is a major contract carrier for FedEx Express, operating in the eastern United States and the Caribbean region.  Previous turboprop operations in South America have been discontinued by FedEx, which now operates jet aircraft in that area.  MAC is one of the largest feeder airlines in the United States.  Its main maintenance facility is at Kinston Regional Jetport.  All of the ATR and C208 aircraft operated by Mountain Air are owned by Fedex Express, and are operated by MAC on a "dry lease" basis.
Answer: cargo airline