UA64 EWR-LIS 78X cancelled due to an unexpected operational issue after a 3 hr 15 min delay. Replacement flight UA3031 was scheduled 4 hrs 55 mins later than scheduled with a 789, but was cancelled due to maintenance after a 30 min delay. Return UA65 LIS-EWR on 12/29 cancelled as a result.
UA206 BOG-IAH 752 cancelled due to maintenance after a 1 hour delay.
UA854 IAH-LIM 763 cancelled due to maintenance after a 6 hr 40 min delay. Return UA855 LIM-IAH on 12/29 cancelled as a result.
UA927 FRA-SFO 772 cancelled due to maintenance after a 2 hr 5 min delay.
UA1002 IAH-UIO 752 cancelled due to maintenance after a 6 hr 49 min delay. Return UA2083 UIO-IAH on 12/29 cancelled as a result.