L-3 Communications' chairman and chief executive officer today expressed doubt that Boeing and the Air Force will be able to finalize a deal on the lease of 767 aircraft as refueling tankers by this summer. Inside the Air Force last week quoted congressional and industry sources as saying that the service can expect its first Boeing 767 tanker deliveries as soon as 2005 if service and company officials are able to agree to a lease arrangement for the future refueling...