Turkish prosecutors have prepared an indictment charging seven people, including four pilots, over former Nissan boss Carlos Ghosn's escape via Istanbul to Lebanon after fleeing Japan, a lawyer for one of the suspects said today. 

The lawyer said the indictment formally charged the four pilots and a company executive with "migrant smuggling".

This crime carries a maximum sentence of eight years in jail. 

Two flight attendants were charged with failing to report a crime, which can carry a jail sentence of up to one year, lawyer Mehmet Fatih Danaci told Reuters. 

Turkish police detained the suspects on January 2 and an interior ministry official said at the time that Turkish border police were not notified about Ghosn's arrival, and neither his entry nor his exit were registered.

The following day, Turkish private jet operator MNG Jet said the former Nissan boss had used two of its planes illegally in his escape from Japan.

It said an employee had falsified lease records to exclude his name from the documents.

At the time, MNG Jet said it had filed a criminal complaint over the incident. 

Carlos Ghosn has said he fled to Lebanon to escape what he called a "rigged" justice system in Japan, where he faces charges relating to alleged financial crimes, which he denies.