A Russian Sukhoi Superjet 100 (SSJ100) aircraft with at least 44 people onboard went missing Wednesday during a demonstration flight in Indonesia, according to several news reports.

Emergency services confirmed to local media that the aircraft was missing and that a search effort was underway after the aircraft disappeared from radar near Bogor in West Java province.

AFP reported emergency services saying that the aircraft dropped from 10,000 ft. to 6,000 ft. before disappearing.

The aircraft had been on the second of two demonstration flights, and those onboard were invited guests, according to the BBC.

The 100-seat SSJ100 is a joint venture aircraft produced by Sukhoi, Finmeccanica and other companies. It entered service in 2011 with Armenian Armavia and gained European Aviation Safety Agency certification in early February (ATW Daily News, Feb. 7).