JOHNSON SPACE CENTER The new U.S.-Russian space partnership got off to a flying start when Discovery and Mir—by far the two largest spacecraft ever to rendezvous—orbited in tight formation as their crews communicated air-to-air and extensively photographed each other.

BOSTON Bombardier Regional Aircraft Div. has chosen a 13,OOO-lb.-thrust CF34-8C engine from General Electric for its new 70-seat CRJ-X regional jet, and GE will invest more than $200 million to develop this CF34 derivative powerplant.

BOSTON As U.S. and Canadian negotiators put the finishing touches on a new bilateral agreement, airlines on both sides of the border are already preparing to offer more flights and to exploit what will soon become a relatively open market.

WASHINGTON Wilcox and E-Systems will shortly begin flight tests of two different types of enhanced differential-GPS systems, which are intended to demonstrate the accuracies needed for Category-3 instrument landings. The upcoming tests are part of a broad FAA effort to demonstrate that GPS is a viable alternative to the Microwave Landing System (MLS), which the FAA developed in the 1970s to replace the long-used ILS.