A clear trend evident among aircraft leasing companies during 2011, and especially in newly established companies such as ALC and Avolon, was the concentration of single aisle new jet aircraft in their portfolios. Very Large Aircraft are a part of the aviation world that appear to have ongoing potential and are being supported by heavy R&D from the manufacturers through the creation of new models such as the B747-8 and the A380. It is also a market that is likely to remain a duopoly as new entrants focus on smaller jets. These planes, however, are not showing up as part of the mainstream leasing sector which itself has strong growth ambitions.