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                          |   | 7 | == Airport Information  | 
                  
                          |   | 8 |   | 
                  
                          |   | 9 | '''Adolfo Suárez Madrid-Barajas''' Airport (MAD) is operated by AENA, being the bigger one in Spain, 5th in Europe and 14th in the world. It has 4 main terminals, which distribute the flights among different airline alliances.  | 
                  
                          |   | 10 |   | 
                  
                          |   | 11 | The bigger and most modern terminal, the T4, concentrates all the flights from OneWorld, and has a Satellite terminal (T4S), for all the non-Schengen flights.  | 
                  
                          |   | 12 |   | 
                  
                          |   | 13 | The official AENA website with all the airport information is [http://www.aena.es/en/madrid-barajas-airport/index.html].  | 
                  
                          |   | 14 |   | 
                  
                          |   | 15 | An alternative non-official website is available at [https://www.aeropuertomadrid-barajas.com/eng/].  | 
                  
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                          |   | 17 | == IBERIA Airlines  | 
                  
                          |   | 18 |   | 
                  
                          |   | 19 | Iberia Airlines is the preferred airline for IETF 108, offering discount on flights to Madrid.  | 
                  
                          |   | 20 |   | 
                  
                          |   | 21 | Complete information is available at [https://ietf.org/how/meetings/108/preferred-airline/].  |