Here is a quick reference chart. 2 cabin aircraft are considered coach and business. First class rates are only applicable in 3 cabin aircraft.
Continental: Maximum of 6 stopovers and 16 total segments.
Coach: 160K, Business: 220K, First: 280K.
Delta: Maximum of 6 stopovers, connections under 24 hours do not count as a stopover.
Coach: 180K, Business: 280K, First: 340K.
USAirways: Maximum of 5 en route stopovers in a forward direction toward the original departure city.
Coach: 200K, Business: 300K, First: 400K.
United: Maximum of 5 stopovers, cannot cross the Pacific and Atlantic more than once each.
Coach: 200K, Business: 300K, First: 400K.
AA: Valid on OneWorld carriers only, max 16 segments, minimum 2 carriers excluding AA, stopovers/connections not allowed in city of origin, maximum of 2 connections and 1 stopover in any city.
Zone 1 (0 to 1,500 miles): Coach: 30K, Business: 60K, First: 80K.
Zone 2 (1,501 - 4,000 miles): Coach: 35K, Business: 75K, First: 100K.
Zone 3 (4,001 - 9,000 miles): Coach: 60K, Business: 80K, First: 100K.
Zone 4 (9,001 - 10,000 miles): Coach: 70K, Business: 90K, First: 120K.
Zone 5 (10,001 - 14,000 miles): Coach: 90K, Business: 115K, First: 150K.
Zone 6 (14,001 - 20,000 miles): Coach: 100K, Business: 130K, First: 180K.
Zone 7 (20,001 - 25,000 miles): Coach: 120K, Business: 150K, First: 230K.
Zone 8 (25,001 - 35,000 miles): Coach: 140K, Business: 190K, First: 280K.
Zone 9 (35,001 - 50,000 miles): Coach: 160K, Business: 220K, First: 330K.