French maritime data analytics platform Kpler wants to buy ship tracking company Spire Maritime, whose satellite data is a vital resource for oil traders and shipping companies, but some Spire customers fear Kpler will cut them off and have raised antitrust concerns to U.S. authorities, sources familiar with the matter say.The $241 million deal announced on Nov. 13 would give Kpler control over Spire's satellites and maritime Automatic Identification System (AIS) data stream, which tracks ships globally, particularly in the open ocean, with a refresh rate of every 15 minutes.This capability is unmatched by competitors, including Orbcomm…