Hong Kong, April 1 -- With around half the world's airline fleet owned or managed by leasing companies and a majority of them grounded for the past year or more it is hardly surprising some lessors have been struggling. Read More But not all of them as the record revenue and big profits announced by Singapore-based BOC Aviation highlights.

Major global leasing companies had a buoyant 2019 and they were able to take advantage of bank debt and access to bond markets to navigate the COVID-19 crisis. Others, however, have not been so fortunate.

The years leading to the outbreak of the pandemic were a golden period for aircraft lessors. Airlines, focused on financial stability, gravitated to leasing large portions of their fleets rather than o...