Our departure time continued to fluctuate. We ended up leaving around 45 minutes late. However, due to strong tail winds we ended up spending only 6 1/2 hours instead of the usual 7 1/2 hours of flight time to London. Of course, once we got to Heathrow, we ended up getting stacked so it all balanced out in the end and we arrived on schedule. The pre-flight entertainment at the gate ended up being quite eventful.