DL16 was only delayed 30 mins and will arrive at LHR at 06.06. There's a curfew until 04.30 at LHR, so it would still have arrived well after the curfew ended anyway, had it left on time! DL134 is estimated to arrive at 07.22, well after any curfew at AMS, so I don't understand the OPs thread! Neither flight would have landed during curfew hours at either airport!