Haven't done one, but might need to pick up 4 segments to keep Silver on CO.
BDL-EWR-BWI and back is $99 on CO. It is WELL WORTH the $100 to get upgrades on all my flights in 2001. The 2,000 miles are just gravy.
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"I will not be pushed, filed, stamped, indexed, briefed, debriefed or numbered. My life is my own."