Although the circumstances for the rescheduling were unfortunate, the Gridiron Stadium Network was

Live Nation Entertainment announced that the U2 360  tour dates in the US, which were recently postponed southwest airline reservations due to Bono's emergency back surgery, have all been rescheduled for Spring/Summer 2011 with all tickets being valid at the rescheduled performances.
U2's manager Paul McGuinness thanked fans for their ongoing support, "We're delighted the dates are rescheduled and in all the same venues southwest airline reservations we originally planned to play. It hasn t been easy to accomplish this and I d like to thank the managers of the many venues and sports teams across North America and Live Nation Global Touring for their help and cooperation in making this complex new plan possible. Above all we want to thank the U2 fans for bearing with us. They're the best and the band wants to get back to where they belong, surrounded by their audience."  The U2 360 Tour is produced by Live Nation Global Touring and sponsored in 2010 by BlackBerry.  via
Although the circumstances for the rescheduling were unfortunate,  the Gridiron Stadium Network was able to add two member stadiums into the new touring schedule.  GSN venues confirmed on the 2011 tour include:
Tickets for the previously scheduled performances will be honored at the door. Tickets for the rescheduled performances will be available at www.livenation.com southwest airline reservations and all usual outlets. southwest airline reservations   Refunds if required available at point of purchase.