2 ways to rebook cancelled flights with a smartphone or tablet

Given all the recent flight cancellations and delays, last week was a terribly bad, no good week for Delta Air Lines passengers. Unfortunately, cancellations and delays are a part of modern air travel, and that's not going to change in the foreseeable future. "Airlines will likely suffer more disruptions like the one that grounded about 2,000 Delta flights [last] week because major carriers have not invested enough to overhaul reservations systems based on technology dating to the 1960s,"