"The fixed wing segment of the ultralight aircraft market, in terms of value, is estimated to account for the largest share of 80.45% in 2015, followed by the flex wing segment that holds an estimated share of 16.09% in the same year. In terms of volume, the flex wing segment leads the ultralight aircraft market, registering a share of 56.63% in 2015, followed by the fixed wing segment with a share of 41.82% in the same year."
Source: From a report by ASDReports, claiming that that the worldwide ultralight aircraft market is expected to reach $389.26 million by 2020, at a compound annual growth rate (CAGR) of 5.23% from 2015 to 2020.