American Airlines restored service Tuesday after a computer outage.
Earlier Tuesday, American Airlines temporarily grounded its fleet after experiencing system issues.
UPDATE: We are now in a system-wide ground delay until 4:00pm CT as we work to resolve this issue. We apologize for any inconvenience.— American Airlines (@AmericanAir) April 16, 2013
In another tweet, the airline said it was having difficulty accessing its reservations system.