Talks are due to start at the end of the month, with two rounds of negotiation by the summer. "We are right on schedule," said finance chief William Willms.

German airline Lufthansa, which on Wednesday offered to buy a minority stake in ITA Airways, hopes for proceeds of between 1 billion and 1.5 billion euros ($1.08 bln to $1.62 billion) for the sale of a 20% share in its maintenance arm, a source with knowledge of the matter said.

Lufthansa declined to comment on the possible proceeds.

The German business is seeking a partner that not only provides financial investment but is also actively involved in the strategic development of the company, the source said.

($1 = 0.9244 euros)

(Reporting by Ilona Wissenbach and Emma-Victoria Farr; Writing by Paul Carrel; Editing by David Goodman)

By Ilona Wissenbach and Emma-Victoria Farr