11.   It leaves from the main terminal at Retiro, in downtown Buenos Aires.

12.   Machine-gun-toting police officers walk on a parapet above the main terminal, scanning the foot traffic below.

13.   Mayor Fiorello La Guardia has been evicted from the main terminal at the airport bearing his name.

14.   Major rental-car agencies are in a separate area near the main terminal, accessible by a free shuttle.

15.   Most of its gates are linked to the main terminal by rail shuttle, the remainder by moving sidewalk.

16.   Officials have said that that line would primarily serve airport employees, although it would also offer a connection between airport parking lots and the main terminals.

17.   Santos Brasil, a private group including investment bank Banco Opportunity and port operator Multiterminais, runs the main terminal where the latest labor confrontation took place.

18.   The airline has the run of the C concourse, which is slightly removed from the main terminal.

19.   The airport has three concourses full of gates, the farthest a mile from the main terminal.

20.   The four other main terminals at the airport remained open throughout the incident.