Poland's president and first lady will be buried on Sunday in a state funeral in Krakow's Wawel cathedral, the historic resting place of the country's kings and former leaders, officials said.
Lech Kaczynski and his wife, Maria Kaczynska, were among 96 people killed on Saturday in a plane crash in western Russia, thought to have been caused by human error.
Stanislaw Kracik, governor of Krakow province, said the couple's funeral would be at 2pm (1200 GMT) in the 1,000-year-old cathedral, the main burial site of Polish monarchs since the 14th century.
The last Polish leader killed in office, General Wladyslaw Sikorski, the exiled second world war leader who died in a mysterious plane crash off Gibraltar in 1943, is also buried there.
Leaders expected for the funeral include the Russian president, Dmitry Medvedev.
Kaczynska's body was flown home from Russia today, and parliament held a special observance in memory of the president and MPs killed in the plane crash.
Kaczynska's body, in a wooden casket draped with Poland's white and red flag, arrived in a military plane shortly after 10.30am at Warsaw's Okecie airport. It was met by Kaczynska's only child, Marta, and by Jaroslaw Kaczynski, her brother-in-law, the twin of the late president.
Her daughter knelt by the casket and wept as a Polish guard of honour stood by.
Kaczynska's body was taken to the presidential palace in a Mercedes-Benz hearse, as was her husband's on Sunday. Thousands of Warsaw residents lined the route.
"I'm here because it's such a tragedy for Poland," said Maja Jelenicka, 63. "I'm in despair. I feel as if I've lost a close relative. Maria Kaczynska was a wonderful woman, kind, with a heart of gold and a real first lady."
The bodies of the first couple are lying in state in closed coffins in the presidential palace, where the president appointed and dismissed governments.
The body of Ryszard Kaczorowski, the last president of Poland's government-in-exile in London, will be brought back today and his coffin will also go on display.
Investigators have suggested human error was to blame in Saturday's crash, saying there were no technical problems with the Soviet-made plane.
The Tu-154 went down while trying to land in dense fog at Smolensk in western Russia. All aboard were killed, including Kaczynski and dozens of Polish political, military and religious leaders.
They had been travelling in the Polish government-owned plane to attend a memorial in the nearby Katyn forest for thousands of Polish military officers executed 70 years ago by Josef Stalin's secret police.
The pilot had been warned of bad weather in Smolensk, and was advised by traffic controllers to land elsewhere, which would have delayed the Katyn observances.
He was identified as Captain Arkadiusz Protasiuk, 36, and the co-pilot as Major Robert Grzywna, 36. Also in the cockpit were Ensign Andrzej Michalak, 36, and Lieutenant Artur Zietek, 31.
Russian traffic controllers said the crew refused to follow their recommendations, a popular Russian daily reported.
Traffic controller Anatoly Muravyev, who was part of the team that handled the plane, told Komsomolskaya Pravda that the crew ignored their warnings about worsening weather at the Smolensk airport.
The crew "started landing with confidence and with no swerving", Muravyev was quoted as saying. "But then the traffic controllers had doubts [about the weather]."
He said the head controller three times ordered the plane to re-attempt the landing and then advised the pilot to fly to another airport.
"The crew did not listen, although the controllers warned them about bad visibility and told them to get ready to fly to a reserve airport," he said.
President Lech Kaczynski and his wife died along with 94 other people

The bodies of Polish President Lech Kaczynski and first lady Maria Kaczynska are lying in state ahead of their funeral on Sunday. The couple died along with 94 other people when the plane they were travelling in crashed in Russia. They will be buried after a memorial to the crash victims. 

President Kaczynski’s body was repatriated from Russia on Sunday while the first lady’s was flown to Warsaw airport on Tuesday. Kaczynska’s coffin was driven to the Presidential Palace while draped in Poland’s flag. Thousands of mourners lined the six mile route as her coffin was transported. The first couple will be buried at Wawel Castle on Sunday. 

Both chambers of parliament held special sessions to honour the crash victims. Poland is currently in seven days of mourning while Russia held a day of mourning on Monday.

The couple were travelling to Russia to mark the 70th anniversary of the Katyn massacre when their plane clipped trees and crashed in Smolensk, Russia. The couple died along with many other senior politicians and military commanders. Other victims included the president of the central bank of Poland, the head of the Polish Olympic Committee and last President of Poland, from the Polish government-in-exile which existed in London during the Nazi and Communist period, Ryszard Kaczorowski. 

Russian President Dmitry Medvedev is expected to attend the funeral. President of the United States Barack Obama and Canadian prime minister Stephen Harper have both announced that they will also attend.