With the increasingly desperate, the United States has joined some of its Arab and European allies in delivering emergency relief from the sky.
The amount of aid brought into the territory by truck has plummeted during nearly five months of war, and Gazans are facing dire shortages of food, water and medicines.
Why is aid being airdropped?
A frenzied scramble for food from a truck convoy delivering aid to northern Gaza left more than 100 people dead on Thursday, according to the Gaza health ministry, after Israeli forces opened fire on the crowd.
With most aid convoys halted, some foreign militaries have airdropped supplies to Gaza instead, sending long lines of aid pallets floating down into the war-torn territory on parachutes.
Jordan has been conducting many of the operations since October, with the support of countries including Britain, France and the Netherlands.
Egypt sent several military planes on an airdrop Thursday, together with the United Arab Emirates.
On Saturday, the US military also began airdropping food into Gaza.
Issues of malnutrition and dehydration
Imad Dughmosh from Al-Sabra in central Gaza said he managed to get some food and water from the aid drops, but there hadn't been enough for everyone waiting.
"In the end, I took bags of pasta and cheese, but my cousins were not able to get anything," the 44-year-old said.
"I was happy because I took some food for the children, but it was not enough."
Deliveries into Gaza have been reduced to a trickle since the war began on 7 October with an unprecedented Hamas attack on southern Israel.
The militants militants killed around 1,160 people and took about 250 hostages, according to Israeli figures.
Israel responded by launching a major military operation including heavy airstrikes and a ground offensive.
Israel's retaliatory offensive against Hamas has killed 30,228 people, according to the Gaza health ministry.
The war between Hamas and Israel is the latest escalation in a long-standing conflict.
Hamas is a Palestinian political and military group, which has governed the Gaza Strip since the most recent elections in 2006.
Hamas’s stated aim is to establish a Palestinian state and stop the Israeli occupation of Gaza and the West Bank, illegal under international law.
What are the risks involved?
In northern Gaza, where Israel began its ground operation, many residents have been reduced to eating animal fodder.
Ten children have died of "malnutrition and dehydration", the health ministry said Friday.
The United States will reportedly join some other countries in delivering emergency relief to Gazans by the sky. Source: AAP / Haitham Imad / EPA
"Most of the aid fell into the sea today, and also the parachutes that fell on Thursday and Wednesday all fell into the sea, except for a very small number," said Hani Ghabboun, who lives in Gaza City with his wife and five children.
He said Gazans need "hundreds of tonnes of aid to confront the famine and feed the people."
Famine 'almost inevitable'
Jens Laerke, spokesman for the UN humanitarian office OCHA, said that there were "many issues" with airdrops, which are better for small, specific missions.
"Aid that comes in in that way is a last resort," he said, adding that it was "not the solution that we prefer" for Gaza.
"Overland transfer is simply better, more efficient, more effective and less costly."
But he warned: "If something doesn't change, a famine is almost inevitable on the current trends."
The United Nations has accused Israeli forces of "systematically" blocking access to Gaza, which Israel denies.
But Biden said on Friday that he would "insist" Israel let in more convoys by land.
"No excuses, because the truth is aid flowing to Gaza is nowhere near enough," he said.
How much does an airdrop cost?
He also said the United States would study a possible "marine corridor" to deliver large amounts of supplies into Gaza.
Aid groups, including the UN agency for Palestinian refugees , say safe road convoys are the best solution for the scale of need in Gaza.
A spokesman for the UN chief Antonio Guterres told reporters that nearly 1,000 trucks are waiting at the Egyptian border and ready to move.
"Airdrops are extremely challenging," Stephane Dujarric said at a briefing this week. "(But) all options remain on the table".
Airdrops can also be expensive.
Jeremy Konyndyk, president of Refugees International, said airdrops can only "help on the margins".
One plane can deliver the equivalent of two truckloads of aid, but at 10 times the cost, he told the BBC World Service on Friday.
"Rather than dropping food from the air, we should be putting immense pressure and using leverage on the Israeli government to allow aid in through more traditional channels that actually deliver at scale."
