Here are the first few lines from a fllight log that I am following:
01:21PM 4214N/8321W 148 1700
01:22PM 4214N/8321W 147 2100
01:22PM 4215N/8321W 167 34000
01:22PM 4217N/8320W 200 3700
01:23PM 4219N/8319W 242 4500
01:24PM 4222N/8323W 218 7800
In the space of two or three minutes it says the plane climbed from 1700 feet to 34000 feet, dropped to 3700 feet and then resumed a normal climb. That would have been fun it was real!