16:55 UT Takeoff from Honolulu airport heading for Christmas Island 17:36 Reach ferrying altitude of 19,000 ft. 18:08 Flying through cloud. Clouds are increasing as we approach ITCZ. 260-X PMS probe and fast ozone sensor not functioning. 18:36 Clouds all around us. From now on, in and out of diffuse cloud. 20:38 Clouds becoming more layered. Stratocumulus banks below us about 80% coverage. Tops about 5-6k ft. with 2-3k underlayer. 20:55 Very settled; no deep clouds; 3.5k ft layer, still with underlayer. 21:04 Shut data system down. 21:13 "Popcorn" cumulus at about 3k ft. 21:18 Data system back up. 21:30 start descent. Top of boundary layer (BL) at 3.2k ft. 21:56 start circle at 100 ft. 22:26 end circle 22:32 start circle at 800 ft. 23:02 end circle 23:06 start circle at 1800 ft. 23:36 end circle 23:40 start circle at 2800 ft 24:10 end circle and descend to 100 ft. 24:16 turn to east at 100 ft. 24:28 start sounding; top of BL at 3200 ft. 24:36 up to 10k ft. and heading WNW flying a diameter over the circle. 25:06 start descent into Christmas Island; BL height at 3200 ft. 25:22 land at Christmas Island.