Question: Where is the head office of the flag carrier which is used by Aeral?

Context paragraphs:
Alitalia: Alitalia – Società Aerea Italiana ("Alitalia – Italian Air Company"), operating as Alitalia (] ), is the flag carrier of Italy.  The company has its head office in Fiumicino, Rome, Italy.  Its main hub is Leonardo da Vinci-Fiumicino Airport, Rome, and a secondary is Linate Airport, Milan.  Other focus airports are Catania-Fontanarossa Airport, Milan-Malpensa Airport, Palermo Airport and Naples Airport.  In 2014, it was the eleventh-largest airline in Europe.  The name "Alitalia" is an Italian portmanteau of the words "ali" (wings), and "Italia" (Italy).

Air Nigeria: Air Nigeria (originally Virgin Nigeria Airways, and then Nigerian Eagle Airlines), was the national flag carrier of Nigeria, which operated scheduled regional and domestic passenger services.  The airline's base was Murtala Mohammed International Airport in Ikeja, its head office was in Lagos Island, Lagos and the C&M building in Crawley, and its registered office was in Ikoyi, Lagos.

Nepal Airlines: Nepal Airlines Corporation (Nepali: नेपाल वायुसेवा निगम ) is the flag carrier airline of Nepal.  Its head office is in the Nepal Airlines Corporation (NAC) Building in Kathmandu, and its main base is Tribhuvan International Airport, Kathmandu.  The airline was established in July 1958 as Royal Nepal Airlines Corporation (RNAC) to be Nepal's first airline.  The airline's first aircraft was a Douglas DC-3, used to serve domestic routes and a handful of destinations in India.  The airline acquired its first jet aircraft, Boeing 727s, in 1972.  As of May 2017, the airline operates a fleet of ten aircraft.

Air Serbia: Air Serbia (stylized as AirSERBIA; Serbian: Ер Србија / "Er Srbija" ) is the flag carrier of Serbia.  The company's head office is in Belgrade, Serbia, and its main hub is Belgrade Nikola Tesla Airport. <ref name="Belgrade Airport, with resurgent Air Serbia, challenges the hub order in Central/Southeast Europe">  </ref> In 2016, it was the fourth-largest legacy carrier in Central and Eastern Europe.  The airline was formerly known as Jat Airways until it was renamed and commenced operations under its new name in 2013.

Aeral: Aeral (contraction of AERonautica ALessandrina) is a defunct private Italian airline, which used ex-Alitalia Douglas DC-8s.

Kenya Airways: Kenya Airways Ltd., more commonly known as Kenya Airways, is the flag carrier of Kenya.  The company was founded in 1977, after the dissolution of East African Airways.  The carrier's head office is located in Embakasi, Nairobi, with its hub at Jomo Kenyatta International Airport.

AirBaltic: airBaltic, legally incorporated as AS Air Baltic Corporation, is a state-owned Latvian low-cost carrier and the country's flag carrier, with its head office on the grounds of Riga International Airport in Mārupe municipality near Riga.  Its main hub is at Riga International Airport with further bases at Tallinn Airport and Vilnius Airport.

Cayman Airways: Cayman Airways is the flag carrier airline of the British Overseas Territory of the Cayman Islands.  With its head office in Grand Cayman, it operates mainly as an international and domestic scheduled passenger carrier, with cargo services available on all routes.  Its operations are based at Owen Roberts International Airport (GCM) in George Town, Grand Cayman.  The airline also offers a limited charter service with a recent example being flights to and from Los Angeles.  Cayman Airways' slogan is "Those who fly us love us".

Air Nicaragua: Nicaragua Airways is the potential future national flag carrier of Nicaragua.  Its main base is Augusto C. Sandino International Airport, Managua.  It is the first time in 20 years that Nicaragua will have a national flag carrier, after Aeronica ceased operations in 1991.  Since then, the flag carrier status was awarded to Nicaragüense de Aviación also known as NICA Airlines.  Several airlines had tried to become the Nicaraguan flag carrier like CAAL (Central American Airlines), SANSA (Servicios Aereos Nicaraguenses S.A.) but none of these survived a year.  Today even NICA Airlines (6Y) is registered as the national airline of Nicaragua, the only international flight it operated once (Managua to Miami) and is done under the TACA code (TA) as a full TACA Airlines flight.

Air Nigeria destinations: Air Nigeria (formerly "Nigerian Eagle Airlines" and "Virgin Nigeria Airways"), was the national flag carrier of Nigeria.  The airline operates scheduled regional and domestic passenger services.  Its base is Murtala Mohammed International Airport, Lagos.  The airline is a replacement for defunct Nigeria Airways.  Its registered office is in Ikoyi, Lagos State, while its head office is on the 9th floor of Etiebets Place in Ikeja, Lagos State.  serves the following destinations (at June 2010):

Supporting paragraphs: Aeral Alitalia
Answer: Fiumicino, Rome, Italy