UA64 EWR-LIS 789 (usually 78X) cancelled due to maintenance. Return UA65 LIS-EWR on 7/31 cancelled as a result. However replacement flights UA3024 and UA3025 were subbed in, scheduled the same time as 64/65.
UA934 EWR-LHR 763 cancelled due to maintenance after an anticipated 11 hour delay. Return UA905 LHR-EWR on 7/31 cancelled as a result.
UA976 EWR-SNN 752 cancelled due to an unexpected operational issue after an anticipated 4 hr 35 min delay. Return UA977 SNN-EWR on 7/31 cancelled as a result.