Oddly there are no 767s in the IAH-EWR/vv schedule past 4/9.

There is a 777 IAH-EWR 7/1-8/26 (may not operate all days), UAL1558.

And before anyone asks, no 787s in the IAH-EWR/vv schedule.

edit: On 4/9, the 763 starts rotating SFO-IAH/vv, but only through 6/5.

edit2: Also on 3/30 the 764 starts rotating IAH-IAD/vv, but only through 6/5.

edit3: Also 3/1 - 6/5 there's a 763 going ORD-IAH/vv.