The United Nations is asking for $6.5 billion in aid to help the millions of Syrians forced from their homes by more than two and a half years of fighting.
U.N. humanitarian chief Valerie Amos said $2.3 billion of that amount is needed for those displaced in Syria. The rest is necessary to help Syrian refugees in Turkey, Lebanon and elsewhere in the region.
The U.N. estimates about 40 percent of Syria's population has been forced from their homes by the fighting.
The U.N. asked for $4.4 billion to help Syrians last year, but says it only received about two-thirds of that amount from donors.
Meanwhile, the U.N. is flying humanitarian aid from Iraq to northern Syria, where people affected by the fighting are dealing with harsh winter conditions.
The aid flights are delivering food, blankets and health supplies.