Papież Franciszek z pierwszą pielgrzymką w USA 536

Pope Francis waves from his Fiat as he prepares to depart for Rome at Philadelphia International Airport in Philadelphia on Sunday, Sept. 27, 2015. (A...

Pope Francis boards a plane at Philadelphia International Airport in Philadelphia, Sunday, Sept. 27, 2015, on his way back to Rome. Pope Francis wrapp...

Pope Francis waves before departing Philadelphia on September 27, 2015 at the end of his six-day visit to the US. AFP PHOTO / NICHOLAS KAMM

US Vice President Joe Biden bids farewell to Pope Francis before he boards his plane in Philadelphia on September 27, 2015 at the end of his six-day v...

Pope Francis boards his plane in Philadelphia on September 27, 2015 at the end of his six-day visit to the US. AFP PHOTO/NICHOLAS KAMM

Pope Francis greets volunteers from the World Meeting of Families at Philadelphia International Airport in Philadelphia before departing for Rome on S...

Pope Francis looks out the window of his plane before departing Philadelphia on September 27, 2015 at the end of his six-day visit to the US. AFP PH...

Pope Francis celebrates Mass on the Benjamin Franklin Parkway, Sunday, Sept. 27, 2015, in Philadelphia. (AP Photo/Alessandra Tarantino)

Pope Francis celebrates Mass on the Benjamin Franklin Parkway, Sunday, Sept. 27, 2015, in Philadelphia. (AP Photo/Alessandra Tarantino)

Thales Farieas, 15, of Miami, prays during Mass conducted by Pope Francis along Benjamin Franklin Parkway Sunday, Sept. 27, 2015, in Philadelphia. (AP...

Pope Francis leaves the altar after celebrating Mass, Sunday, Sept. 27, 2015, in Philadelphia. (AP Photo/Matt Slocum, Pool)

Pope Francis is seen on a huge screen on Benjamin Franklin Parkway in Philadelphia, Sunday, Sept. 27, 2015, during the Papal Mass near the Philadelphi...

Pope Francis celebrates a final Mass at the World Meeting of Families at Benjamin Franklin Parkway in Philadelphia on Sunday, Sept. 27, 2015. (CJ Gunt...

Pope Francis, center, celebrates Mass Sunday, Sept. 27, 2015, in Philadelphia. (AP Photo/Matt Slocum)

A woman receives communion during a Mass celebrated by Pope Francis Sunday, Sept. 27, 2015, in Philadelphia. (AP Photo/Matt Slocum)

Pope Francis delivers his homily while celebrating Mass Sunday, Sept. 27, 2015, in Philadelphia. (AP Photo/Matt Slocum)

Pope Francis celebrates a final Mass at the World Meeting of Families at Benjamin Franklin Parkway in Philadelphia on Sunday, Sept. 27, 2015. (CJ Gunt...

Pope Francis, center, delivers his homily while celebrating Mass Sunday, Sept. 27, 2015, in Philadelphia. (AP Photo/Matt Slocum)

Pope Francis blesses the altar at the beginning of a Mass Sunday, Sept. 27, 2015, in Philadelphia. (AP Photo/Matt Slocum)

Pope Francis, right, extends the Peace of God to Philadelphia archbishop Charles Chaput during a Mass Sunday, Sept. 27, 2015, in Philadelphia. (AP Pho...

Pope Francis accepts the gifts from a family as he celebrates mass at the World Meeting of Families at Benjamin Franklin Parkway in Philadelphia, Penn...

Mary-Anna Worth, of Toronto, prays after receiving communion during a Mass celebrated by Pope Francis on the Benjamin Franklin Parkway, Sunday, Sept....

Communion is given as Pope Francis celebrates Mass, Sunday, Sept. 27, 2015, in Philadelphia. (AP Photo/Matt Slocum, Pool)

A worshiper reads the program as Pope Francis celebrates Mass on the Benjamin Franklin Parkway, Sunday, Sept. 27, 2015, in Philadelphia. (AP Photo/Joh...

Pope Francis, center, arrives to celebrate his final Mass of his visit to the United States at the Festival of Families on Benjamin Franklin Parkway i...

Pope Francis waves from his popemobile as he heads to celebrate Mass at the conclusion of the World Meeting of Families along the Benjamin Franklin Pa...

Pope Francis holds the Gospel Book during a Mass on the Benjamin Franklin Parkway, Sunday, Sept. 27, 2015, in Philadelphia. (AP Photo/Alessandra Taran...

Pope Francis blesses the altar during a Mass on the Benjamin Franklin Parkway, Sunday, Sept. 27, 2015, in Philadelphia. (AP Photo/Alessandra Tarantino...

Pope Francis delivers a final Mass at the World Meeting of Families at Benjamin Franklin Parkway in Philadelphia on Sunday, Sept. 27, 2015. (CJ Gunthe...

Pope Francis holds the Gospel Book during a Mass on the Benjamin Franklin Parkway, Sunday, Sept. 27, 2015, in Philadelphia. (AP Photo/Alessandra Taran...

Pope Francis delivers a final Mass at the World Meeting of Families at Benjamin Franklin Parkway in Philadelphia on Sunday, Sept. 27, 2015. (CJ Gunthe...

Pope Francis celebrates mass at the World Meeting of Families at Benjamin Franklin Parkway in Philadelphia, Pennsylvania, September 27, 2015. AFP P...

Chalices for communion are prepared during a mass celebrated by Pope Francis at Benjamin Franklin Parkway in Philadelphia, Pennsylvania, on September...

Chalices for communion are prepared during a mass celebrated by Pope Francis at Benjamin Franklin Parkway in Philadelphia, Pennsylvania, on September...

Pope Francis celebrates mass at the World Meeting of Families at Benjamin Franklin Parkway in Philadelphia, Pennsylvania, September 27, 2015. AFP P...

An unidentified child, who was carried out from the crowd to meet Pope Francis, reaches out to touch the Pontiff's face during a parade on his way to...

Pope Francis delivers a Mass at the World Meeting of Families at Benjamin Franklin Parkway in Philadelphia on Sunday, Sept. 27, 2015. (CJ Gunther/Pool...

Pope Francis delivers a Mass at the World Meeting of Families at Benjamin Franklin Parkway in Philadelphia on Sunday, Sept. 27, 2015. (CJ Gunther/Pool...

Pope Francis kisses the altar as he arrives for a Mass on the Benjamin Franklin Parkway, Sunday, Sept. 27, 2015, in Philadelphia. (AP Photo/Alessandr...

Pope Francis delivers his sermon during Mass at Benjamin Franklin Parkway in Philadelphia, Pennsylvania, on September 27, 2015. AFP PHOTO / VINCENZO P...

Pope Francis leads an open-air Mass on the Benjamin Franklin Parkway in Philadelphia, Pennsylvania, on September 27, 2015. AFP PHOTO / VINCENZO PINT...

Pope Francis leads an open-air Mass on the Benjamin Franklin Parkway in Philadelphia, Pennsylvania, on September 27, 2015. AFP PHOTO / VINCENZO PINT...

Pope Francis celebrates Mass at Benjamin Franklin Parkway in Philadelphia, Pennsylvania, on September 27, 2015. AFP PHOTO / VINCENZO PINTO

Pope Francis delivers his sermon during Mass at Benjamin Franklin Parkway in Philadelphia, Pennsylvania, on September 27, 2015. AFP PHOTO / VINCENZO P...

Pope Francis celebrates mass at the World Meeting of Families at Benjamin Franklin Parkway in Philadelphia, Pennsylvania, September 27, 2015. AFP P...

Pope Francis celebrates an mass at Benjamin Franklin Parkway in Philadelphia, Pennsylvania, on September 27, 2015. AFP PHOTO / VINCENZO PINTO

Pope Francis leads an open-air mass at the Benjamin Franklin Parkway in Philadelphia, Pennsylvania, on September 27, 2015. AFP PHOTO/JEWEL SAMAD

Pope Francis leads an open-air mass at the Benjamin Franklin Parkway in Philadelphia, Pennsylvania, on September 27, 2015. AFP PHOTO/JEWEL SAMAD

Pope Francis celebrates an open-air mass at the Benjamin Franklin Parkway in Philadelphia, Pennsylvania, on September 27, 2015. AFP PHOTO / VINCENZO P...

Pope Francis celebrates mass at the World Meeting of Families at Benjamin Franklin Parkway in Philadelphia on Sunday, Sept. 27, 2015. (CJ Gunther/Pool...