Port-au-Prince, Haiti (CNN) -- At least one organization attempting to deliver aid to Haiti continued to be plagued Sunday by delays and logistical problems, but aid was getting to those who need it most, officials said.





Doctors Without Borders said Sunday that, despite guarantees from the United Nations and the U.S. Defense Department, its cargo plane carrying an inflatable surgical hospital was blocked from landing in Port-au-Prince the day before and was rerouted to Samana, Dominican Republic. Samana is in the eastern portion of the Dominican Republic and across the Caribbean island of Hispaniola, shared by the two nations, from Port-au-Prince.





The material was being sent by truck from Samana, said the group, also known in French as Médecins Sans Frontières. However, the re-routing added a 24-hour delay to the hospital's arrival.





A second Doctors Without Borders plane was able to land on Sunday. That plane carried additional medical supplies and hospital equipment, the group said, adding it is still concerned about delays in the delivery of vital supplies.





"If this plane is also rerouted, then the hospital will be further delayed, in a situation where thousands of wounded are still in need of life saving treatment," a group statement said. It was unclear Sunday afternoon whether the plane had landed.





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The surgical hospital includes two operating theaters, an intensive-care unit, 100-bed hospitalization capacity, an emergency room and all the necessary equipment needed for sterilizing material.





"MSF teams are currently working around the clock in five different hospitals in Port-au-Prince, but only two operating theaters are fully functional, while a third operating theater has been improvised for minor surgery due to the massive influx of wounded and lack of functional referral structures," the organization said.





The group said two of its medical teams have performed more than 100 operations since arriving in the country, but frustrations are high over the delays.





An emergency communications officer with the group in Haiti said conditions are growing worse for patients and "we need the inflatable hospital -- if it ever arrives."





"Patients who were not critical only three days ago are now in critical phases," she wrote in a news release. "This means that people will die from preventable infections. It's horrible."





Planes are asked to divert elsewhere if they don't have the fuel to stay in a holding pattern, Col. Buck Elton of U. S. Special Operations Command South told reporters Sunday. Only two planes had been diverted Sunday, he said.





Asked about the matter on CNN's "State of the Union" Sunday, Lt. Gen. P.K. Keen, deputy commander of U.S. Southern Command, said the Port-au-Prince airport, which is being run by the U.S. military, is operating at maximum capacity 24 hours a day.





"It's a matter of balance between getting relief supplies on the ground, getting the people on the ground that are necessary to get those relief supplies distributed, and getting the logistical capacity on the ground to continue that, and the vehicles so we can get it out by ground as well as by air," he said.





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More aid was on the way. The National Organization for the Advancement of Haitians held an earthquake survival kit drive at the Haitian embassy in Washington, saying it was accepting items including baby formula, diapers, toiletries, vitamins, medicines, batteries and clothing. Hundreds of people turned out, and they brought enough to fill several trucks full. The overflow of supplies was piled along the embassy's walls and stairwells.





U.S. paratroopers using helicopters from an aircraft carrier delivered 130,000 daily-ration packets on Saturday, Keen of U.S. Southern Command said on "Fox News Sunday." Some 70,000 bottles of water were also delivered, he said.





One helicopter could not land and was forced to drop supplies, Keen said, but the delivery otherwise encountered no problems and was orderly. Keen called it a good day.





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question: who is experiencing delays, answer: Doctors Without Borders | question: what is finally reaching those who need it, answer: aid