Regional aircraft could come under pressure should Pinnacle Airlines file for bankruptcy protection and if American Airlines decides to further streamline its domestic operations.
According to Flightglobal's Ascend database, Pinnacle operates 151 Bombardier CRJs, while its subsidiary, Colgan Air, has 29 Dash8Q-400s in its fleet.
Pinnacle owns 16 CRJ-900s and some of its 50-seat CRJ-200LRs.
However, the majority of its CRJ-200LR fleet is on lease from various entities belonging to Delta Airlines, Northwest Airlines and Wells Fargo Bank.
Among those are 70 aircraft that were initially ordered as the CRJ-400LR model. Bombardier sold a total of 86 CRJ-400LRs, with 70 units operated by Pinnacle and the remaining 16 aircraft at Mesaba Airlines.
Pinnacle converted the -440LR aircraft into the -200LR model with 50 seats in 2006.
Looking at American Airlines' American Eagle subsidiary, it operates 216 Embraer ERJ family aircraft, which were financed by Agencia Especial De Financiamento Ind-Finame, a division of BNDES of Brazil, according to Ascend data.
American has 47 CRJ aircraft with 41 financed by Export Development Canada and the remaining six financed by Bombardier Capital.
American also has 41 Saab 340 turboprops, which are in storage. Several different European banks financed 23 assets. Westdeutsche Landesbank Girozentrale has the largest exposure to American with funding in place on on nine Saab 340s.
Executive Airlines, which is another regional division of American Airlines, operates ATR aircraft. All assets are under operating lease from Nordic Aviation Capital.