The Ockham stack was crazy buzy this morning, with plenty of low-flying aircraft in a holding pattern for LHR as I was waiting for my train. This is so much more fun with the Flightradar24 app on my phone - and I often see the same aircraft doing more than one round above me before my train arrives. Rather to my surprise, at one point the two aircraft flying almost directly above me at the same time were UA flights from IAD to LHR – UA918 and UA130. The former is a 777 service departing IAD 0605 PM and the latter a 757 service departing 0655 PM. There is no PM flight before that and only one after – 1000 PM. Actually, the later flight was flying just ahead of the earlier one, which was over an hour late taking off – it’s estimated to land at 0709, and the other one at 0644. Just like London buses – you wait forever for one, and then two arrive at once! But really, what’s the point of having two flights scheduled 50 minutes apart and then nothing for over three hours – seems especially pointless given the second one is an itty bitty 757? I’m pretty sure they weren’t scheduled that close together when there were four widebodies a day doing the route. BA has three PM departures as well, but evenly distributed in two-hour intervals (635/830/1030), which surely makes more sense? Presumably, the middle one of these must cost UA a significant amount of business from customers with flexible premium tickets who don't want to hang around drinking Bud Light in the UA Club for an extra hour and a half.