Question: International Consolidated Airlines Group, S.A., often shortened to IAG, is an Anglo-Spanish multinational airline holding company,  it was formed in January of which year, after a merger agreement between British Airways and Iberia, the flag carrier airlines of the United Kingdom and Spain respectively?
Sentence (from "Iberia (airline)"): Iberia ( ), legally incorporated as "Iberia, Líneas Aéreas de España, S.A. Operadora, Sociedad Unipersonal", is the flag carrier airline of Spain founded in 1927.
Relevant evidence: Yes