The fourth season was aired during 2009, between June 23 to September 19, and was the first to be broadcast in high definition.
Auditions were held between January to April, with a change in cities used - while the program returned to New York, Los Angeles, Chicago and Atlanta, it also held auditions within Washington, D.C., Miami, Tacoma, Boston, and Houston.
Alongside live auditions and home audition tapes, participants were given the opportunity to register their auditions through uploading a video direct to the program's website.
This season saw results episodes being reinstated back to their original broadcast schedule in the first season, including being allocated one-hour timeslots, while the "Las Vegas Callbacks" were redubbed as "Vegas Verdicts" by the production team in this season.
In addition, the winning act not only received a cash prize at the end of the competition, but was also given their own, 10-week headline show at the Planet Hollywood Resort and Casino on the Las Vegas Strip.

Springer left the program following the conclusion of the previous season, owing to other TV commitments he had, leading him to be replaced as the program's host by Nick Cannon in February.
This season was won by country music singer Kevin Skinner, with opera singer Bárbara Padilla coming in second, and percussionists Recycled Percussion placing third.
The fourth season was aired during 2009, between June 23 to September 19, and was the first to be broadcast in high definition. Auditions were held between January to April, with a change in cities used - while the program returned to New York, Los Angeles, Chicago and Atlanta, it also held auditions within Washington, D.C., Miami, Tacoma, Boston, and Houston. Alongside live auditions and home audition tapes, participants were given the opportunity to register their auditions through uploading a video direct to the program's website. This season saw results episodes being reinstated back to their original broadcast schedule in the first season, including being allocated one-hour timeslots, while the "Las Vegas Callbacks" were redubbed as "Vegas Verdicts" by the production team in this season. In addition, the winning act not only received a cash prize at the end of the competition, but was also given their own, 10-week headline show at the Planet Hollywood Resort and Casino on the Las Vegas Strip.
Springer left the program following the conclusion of the previous season, owing to other TV commitments he had, leading him to be replaced as the program's host by Nick Cannon in February. This season was won by country music singer Kevin Skinner, with opera singer Bárbara Padilla coming in second, and percussionists Recycled Percussion placing third.
America's Got Talent