SpaceX delays launch of O3b mPOWER mission for SES.

TL;DR
SpaceX is set to launch the O3b mPOWER 3 & 4 mission on Friday, concluding a series of three scheduled launches in less than 30 hours. The Medium Earth Orbit (MEO) satellite constellation provides high-throughput low-latency data and internet services to a variety of commercial and government customers. The mPOWER satellites will form a second-generation constellation of O3b satellites, with O3b mPOWER 3 and 4 the second pair of satellites in this generation. The satellites are built by Boeing and are based on the Boeing 702X satellite bus.
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