BBC: The bodies of Polish President Lech Kaczynski and First Lady Maria Kaczynska are now lying in state in the capital, Warsaw.
Maria Kaczynska's body arrived earlier from Moscow amid emotional scenes after Saturday's plane crash in Russia that killed the couple and 94 others.
Parliament has held a special session to honour those killed in the disaster.
The first couple are to be buried on Sunday, a day after a memorial service for the victims in the Polish capital.
US President Barack Obama has said he will attend the funeral on Sunday.
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A guard of honour stood to attention in the rain at Warsaw airport as the body of the first lady arrived on a military plane. President Kaczynski's remains were repatriated on Sunday.
After a brief religious ceremony, mourners took turns to kneel at Maria Kaczynska's casket and pay their respects as it stood on the tarmac.
They included the late first couple's only child, daughter Marta, and Jaroslaw Kaczynski, identical twin of the late president.
Maria Kaczynska's coffin, draped with Poland's white-and-red flag, was then driven through the streets of Warsaw to the presidential palace.
Thousands of Poles lined the 10km (6 mile) route to the city centre, covering the hearse with flowers, then took turns to file past the coffins.
The first couple will be laid to rest on Sunday at Wawel Castle in the southern city of Krakow, according to Poland's PAP news agency. Read on and watch BBC video – The first couple's only child, Marta, led mourners >>> | Tuesday, April 13, 2010
