Shares in Boeing Co. have fallen almost five per cent over the past two days in the wake of two incidents involving the manufacturer's new 787 Dreamliner.

Boeing stock was down 2.78 per cent, or $2.12 to $74.01 in New York in Tuesday afternoon trading. That, after losing some two per cent in Monday trading.

In the most recent incident, officials at Boston's Logan International Airport said Tuesday that crews had contained a fuel leak from an outbound Japan Airlines flight to Tokyo.

Massachusetts Port Authority spokesman Richard Walsh says the Boeing 787 was towed back to the gate for evaluation after about 151 litres of fuel spilled.

On Monday, a fire broke out in a battery pack in a different Japan Airlines plane, also a Boeing 787, filling the cabin with smoke minutes after passengers disembarked.

The Federal Aviation Administration and National Transportation Safety Board are investigating the fire.