Families of passengers say the disaster plunged them into financial distress.
Chinese authorities reported an increase in the incidence of respiratory diseases in the country last Monday.
Beijing is accusing the US President of "irresponsible political manipulation".
"A piss that will ruin a lot of money, this worker has done some real damage here."
The Canadian military plane was helping in a UN operation over international waters.
Several top-level officials have disappeared in the past year without a trace.
Questions are being raised about his judgment and confidence in him is dampening.
"We are asking countries to raise it during their bilateral meetings - to urge Beijing to cooperate."
A recent deluge caused a lake in Maoming to overflow, setting the crocodiles free.