Buenos Aires ( or ; ) is the capital and most populous city of Argentina. The city is located on the western shore of the estuary of the Río de la Plata, on the South American continent's southeastern coast. "Buenos aires" can be translated as "fair winds" or "good airs", but the first one was the meaning intended by the founders in the 16th century, by the use of the original name "Real de Nuestra Señora Santa María del Buen Ayre". The Greater Buenos Aires conurbation, which also includes several Buenos Aires Province districts, constitutes the fourth-most populous metropolitan area in the Americas, with a population of around 17 million. 

The city of Buenos Aires is neither part of Buenos Aires Province nor the Province's capital; rather, it is an autonomous district. In 1880, after decades of political infighting, Buenos Aires was federalized and removed from Buenos Aires Province. The city limits were enlarged to include the towns of Belgrano and Flores; both are now neighborhoods of the city. The 1994 constitutional amendment granted the city autonomy, hence its formal name: Ciudad Autónoma de Buenos Aires (Autonomous City of Buenos Aires). Its citizens first elected a chief of government (i.e. mayor) in 1996; previously, the mayor was directly appointed by the President of the Republic.
What is the population?
What did they do in 1996?
What is another name for this?
What happened before that?
Where did the city's leader come from before?
By whom?
Is it a small city?
What is its rank?
Is it in a Province?
Since when?
around 17 million
population of around 17 million
Its citizens first elected a chief of government
Its citizens first elected a chief of government
mayor
mayor
the city was granted autonomy
The 1994 constitutional amendment granted the city autonomy
the mayor was directly appointed
previously, the mayor was directly appointed 
the President of the Republic.
the President of the Republic.
No
most populous city of Argentin
it is the most populous city of Argentina
most populous city of Argentina
No
Buenos Aires is neither part of Buenos Aires Province nor the Province's capital
1994
1994 constitutional amendment granted the city autonomy