Guggenheim Aviation Partners is offering a 15-aircraft portfolio for sale in the market as part of its "ongoing portfolio management strategy", sources indicate.
The fleet includes three Airbus A330-200, three Airbus A330-300, three Boeing 777-200ER, three 777-300ER and three 777-200LRF aircraft, sources say.
Twelve units are "2009-build and younger", while the rest are "early 2000-build" aircraft, says a source.
In February this year, American Airlines received bankruptcy court approval for sale and leaseback financing with Guggenheim for up to two Boeing 777-300ERs.
In the same month, the financier was mandated by Etihad Airways to fund two Boeing 777-300ERs and one Airbus A330-300F for the carrier, sources say.
Guggenheim was unavailable for comment at the time of press.