SUKKUR (AFP) US aid pouring into Pakistans flood-hit regions is helping reverse widespread anti-American sentiment but will not be enough to win hearts and minds in the long term, experts say. The United States has been the biggest and the quickest single international floods donor, committing 200 million dollars to help its ally in the fight against extremism recover from its worst-ever natural disaster. The United States currently has 22 helicopters rescuing stranded villagers and ferrying relief supplies around the country, with four more on the way, said embassy spokesman Richard Snelsire. The superpower has been involved in every area of the relief effort, spending its millions mostly through the United Nations, and international and local charity channels, to supply tonnes of food, water, shelter and medicine. Fifty million dollars has already been diverted from a 7.5-billion-dollar aid package approved by the US Congress last year in a bid to deepen ties with the South Asian nuclear power, a key partner in the fight against Taliban and Al-Qaeda-linked militants. Victims are grateful for the help but many Pakistanis think it ironic that while the United States is sending tonnes of aid, it is also sending drones to bomb militant hideouts in the border areas with Afghanistan. And the gratitude may be short-lived, just as it was after a swell of support from America following Pakistans 2005 earthquake that left 73,000 dead, said Pakistan analyst Rahimullah Yusufzai. There will be goodwill created, its already happening for America and it also happened in October 2005 during the earthquake... but that was for a short while and this is again the fear that it may not last long, said Yusufzai. (Aid) must happen on a long-term basis, he said. Theres a changing perception about America but not on such a big scale right now because at the same time Americas helping out they are also bombing Pakistan territory. During a visit to Pakistans devastated submerged regions last week, head of aid agency USAID Rajiv Shah sought to assure officials that the United States would keep a commitment to help Pakistan in the long term. But touring Sukkur, once a thriving semi-industrial trading post - now reduced to a city of tarpaulin tents providing thin respite from the heat for thousands of families, the scale of the challenge was clear. This is going to be very, very difficult, this is a huge-scale disaster, said Shah. But we have to continue to be optimistic and look for those opportunities to help Pakistan to use this to build back better. The floods have already forced the United States to rethink its spending in Pakistan, after announcing in July a series of water, energy and healthcare projects to improve the countrys dire infrastructure.