Mass in memory of Polish President Lech Kaczynski and his wife Maria started at 2 p.m. CET.
Poland's Prime MinisterDonald Tusk and acting president Bronislaw Komorowski are in attendance, as are RussianPresident Dmitri Medvedev, Ukrainian President Viktor Yushchenko,former prime minister Yulia Tymoshenko and numerous Polish and foreign dignitaries.
Early on Sunday, a Polish military plane delivered the bodies of Kaczynski and his wife Maria from Warsaw to Krakow for burial.
40 thousand crowd Krakow's central square, before the Basilica.
The first couple will be buried at Krakow's Wawel Crypt, under the castle's Silver Bell Tower.