Airlines including Qantas Airways and Air Berlin altered their flight paths months ago to avoid Ukrainian air space after fighting flared up in the region, raising questions about why others did not do the same.
The debris, found on Pemba Island off the Tanzanian coast, is the latest piece of wreckage to be linked to the Malaysia Airlines jet, whose disappearance remains a mystery.
More plane parts have been washed up on Reunion Island where a wing part from missing Flight MH30 was recovered, the Malaysian transport ministry said on Thursday.
More metallic debris was washed ashore on the Indian Ocean island of Reunion on Sunday as investigators probe the missing flight MH370.
Two pieces of plane debris found in Mozambique arrived in Australia, where experts will determine whether they are from the missing Malaysia Airlines Flight 370.
The discovery of debris may not solve the mystery of what happened to the plane, warn aviation experts
A Thai satellite has spotted hundreds of floating objects in southern Indian Ocean that could possibly be the debris of the crashed Malaysian plane, even as bad weather on Thursday grounded multination aerial search for the aircraft's wreckage.
Wreckage washed up on a remote Indian Ocean island is "very likely from a Boeing 777", Malaysian Prime Minister Najib Razak said on Thursday as speculation mounted it could be from MH370 that vanished mysteriously over a year ago with 239 people, including five Indians, on board.
The search for the crashed Malaysian jet on Friday dramatically shifted to a new area 1,100 km further northeast in the Indian Ocean after authorities received "the most credible lead" of radar data suggesting the plane flew faster and ran out of fuel more quickly than estimated.