updated 6/8/2011 6:46:39 PM ET 2011-06-08T22:46:39

MONTERREY, Mexico, June 8, 2011 (GLOBE NEWSWIRE) -- Mexican airport operator Grupo Aeroportuario del Centro Norte, S.A.B. de C.V., known as OMA (Nasdaq:OMAB) (BMV:OMA), reports that terminal passenger traffic at its 13 airports increased 1.7% in May 2011, as compared to May 2010. Domestic traffic increased 2.9%, and international traffic decreased 5.7%.

Of total May traffic, 96.3% was commercial aviation and 3.7% was general aviation.

Total Passengers*
  Apr-10 Apr-11 Change % Jan-Apr 2010 Jan-Apr 2011 Change %
Domestic 837,754 862,144 2.9 3,824,768 3,830,556 0.2
International 132,775 125,196 (5.7) 893,470 808,796 (9.5)
OMA Total 970,529 987,340 1.7 4,718,238 4,639,352 (1.7)
* Terminal passengers: includes passengers on the three types of aviation (commercial, charter, and general aviation), and excludes passengers in transit.            

Domestic traffic increased in nine airports in May, with the most noteworthy increases in Monterrey (+4.9%), Tampico (+24.5%), Ciudad Juárez (+14.3%), Torreón (+12.7%), and San Luis Potosí (+24.2%). In Monterrey, traffic increased on the Mexico City and Cancún routes. In Tampico, traffic increased on the routes to Mexico City and Monterrey. In Ciudad Juárez, general aviation increased, as did traffic on the Mexico City route. In Torreón, traffic increased on the Mexico City route. In San Luis Potosí, there was an increase on the Mexico City route and in general aviation. Traffic decreased most at the airports in Acapulco (-26.5%), Culiacán (-5.0%), and Chihuahua (-6.0%). In Acapulco, the reduction was primarily on the Mexico City and Guadalajara routes. In Culiacán, the reduction was on the Toluca and Tijuana routes. The reduction in Chihuahua was principally on the Toluca and Guadalajara routes. The suspension of the airlines of Grupo Mexicana continued to affect Culiacán and Acapulco traffic.

International traffic increased most significantly in Monterrey (+15.6%), principally on the Houston route. The greatest decreases were recorded in Zacatecas (-53.9%), Mazatlán (-18.8%), Zihuatanejo (-34.4%), and Acapulco (-45.2%).  Zacatecas traffic decreased most on the Los Angeles route. Mazatlán traffic decreased most on the Los Angeles and Phoenix routes. Zihuatanejo traffic decreased principally on the Los Angeles and Houston routes. Acapulco was most affected on the Houston route.

The total number of flight operations (takeoffs and landings) in January decreased 7.9% as compared to the prior year period. Domestic flights decreased 9.0%, and international flights increased 0.8%.

The complete traffic report is available at http://ir.oma.aero.

This press release may contain forward-looking information and statements. Forward-looking statements are statements that are not historical facts. These statements are only predictions based on our current expectations and projections about future events. Forward-looking statements may be identified by the words "believe," "expect," "anticipate," "target," or similar expressions. While OMA's management believes that the expectations reflected in such forward-looking statements are reasonable, investors are cautioned that forward-looking information and statements are subject to various risks and uncertainties, many of which are difficult to predict and are generally beyond the control of OMA, that could cause actual results and developments to differ materially from those expressed in, or implied or projected by, the forward-looking information and statements. These risks and uncertainties include, but are not limited to, those discussed in our most recent annual report filed on Form 20-F under the caption "Risk Factors." OMA undertakes no obligation to publicly update its forward-looking statements, whether as a result of new information, future events, or otherwise.

About OMA

Grupo Aeroportuario del Centro Norte, S.A.B. de C.V., known as OMA, operates 13 international airports in nine states of central and northern Mexico. OMA's airports serve Monterrey, Mexico's third largest metropolitan area, the tourist destinations of Acapulco, Mazatlán, and Zihuatanejo, and nine other regional centers and border cities. OMA also operates a hotel and commercial areas inside Terminal 2 of the Mexico City airport. OMA employs over 1,000 persons in order to offer passengers and clients, airport and commercial services in facilities that comply with all applicable international safety, security standards, and ISO 9001:2008. OMA's strategic shareholder members are ICA, Mexico's largest engineering, procurement, and construction company, and Aéroports de Paris Management, subsidiary of Aéroports de Paris, the second largest European airports operator. OMA is listed on the Mexican Stock Exchange (OMA) and on the NASDAQ Global Select Market (OMAB). For more information, please visit us at:

CONTACT: Jose Luis Guerrero Cortes
         OMA, CFO
         +52.81.8625.4300 ext.308
         jlguerrero@oma.aero
         
         Daniel Wilson
         Zemi Communications
         +1.212.689.9560 ext. 264
         dbmwilson@zemi.com

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