Month	Millions Of Passenger-Miles
1921-07-01	511.000
1921-08-01	514.000
1921-09-01	486.000
1921-10-01	486.000
1921-11-01	476.000
1921-12-01	460.000
1922-01-01	515.000
1922-02-01	468.000
1922-03-01	497.000
1922-04-01	491.000
1922-05-01	520.000
1922-06-01	517.000
1922-07-01	541.000
1922-08-01	532.000
1922-09-01	514.000
1922-10-01	534.000
1922-11-01	494.000
1922-12-01	509.000
1923-01-01	541.000
1923-02-01	493.000
1923-03-01	520.000
1923-04-01	535.000
1923-05-01	534.000
1923-06-01	532.000
1923-07-01	574.000
1923-08-01	538.000
1923-09-01	544.000
1923-10-01	552.000
1923-11-01	520.000
1923-12-01	521.000
1924-01-01	546.000
1924-02-01	516.000
1924-03-01	538.000
1924-04-01	526.000
1924-05-01	522.000
1924-06-01	545.000
1924-07-01	548.000
1924-08-01	514.000
1924-09-01	565.000
1924-10-01	536.000
1924-11-01	519.000
1924-12-01	532.000
1925-01-01	555.000
1925-02-01	512.000
1925-03-01	549.000
1925-04-01	530.000
1925-05-01	524.000
1925-06-01	561.000
1925-07-01	571.000
1925-08-01	551.000
1925-09-01	556.000
1925-10-01	546.000
1925-11-01	551.000
1925-12-01	524.000
1926-01-01	555.000
1926-02-01	518.000
1926-03-01	553.000
1926-04-01	536.000
1926-05-01	534.000
1926-06-01	565.000
1926-07-01	552.000
1926-08-01	560.000
1926-09-01	568.000
1926-10-01	556.000
1926-11-01	564.000
1926-12-01	543.000
1927-01-01	582.000
1927-02-01	532.000
1927-03-01	559.000
1927-04-01	535.000
1927-05-01	560.000
1927-06-01	541.000
1927-07-01	554.000
1927-08-01	564.000
1927-09-01	558.000
1927-10-01	570.000
1927-11-01	556.000
1927-12-01	538.000
1928-01-01	578.000
1928-02-01	536.000
1928-03-01	541.000
1928-04-01	550.000
1928-05-01	544.000
1928-06-01	532.000
1928-07-01	572.000
1928-08-01	533.000
1928-09-01	569.000
1928-10-01	579.000
1928-11-01	543.000
1928-12-01	549.000
1929-01-01	584.000
1929-02-01	546.000
1929-03-01	556.000
1929-04-01	579.000
1929-05-01	560.000
1929-06-01	564.000
1929-07-01	606.000
1929-08-01	559.000
1929-09-01	618.000
1929-10-01	588.000
1929-11-01	559.000
1929-12-01	579.000
1930-01-01	589.000
1930-02-01	547.000
1930-03-01	578.000
1930-04-01	560.000
1930-05-01	543.000
1930-06-01	578.000
1930-07-01	559.000
1930-08-01	519.000
1930-09-01	594.000
1930-10-01	546.000
1930-11-01	528.000
1930-12-01	526.000
1931-01-01	532.000
1931-02-01	496.000
1931-03-01	534.000
1931-04-01	512.000
1931-05-01	495.000
1931-06-01	526.000
1931-07-01	501.000
1931-08-01	504.000
1931-09-01	511.000
1931-10-01	476.000
1931-11-01	485.000
1931-12-01	447.000
1932-01-01	470.000
1932-02-01	452.000
1932-03-01	458.000
1932-04-01	417.000
1932-05-01	430.000
1932-06-01	399.000
1932-07-01	393.000
1932-08-01	399.000
1932-09-01	405.000
1932-10-01	409.000
1932-11-01	387.000
1932-12-01	367.000
1933-01-01	392.000
1933-02-01	359.000
1933-03-01	358.000
1933-04-01	348.000
1933-05-01	368.000
1933-06-01	349.000
1933-07-01	368.000
1933-08-01	353.000
1933-09-01	359.000
1933-10-01	376.000
1933-11-01	336.000
1933-12-01	347.000
1934-01-01	372.000
1934-02-01	339.000
1934-03-01	345.000
1934-04-01	360.000
1934-05-01	348.000
1934-06-01	340.000
1934-07-01	359.000
1934-08-01	324.000
1934-09-01	347.000
1934-10-01	361.000
1934-11-01	326.000
1934-12-01	339.000
1935-01-01	358.000
1935-02-01	333.000
1935-03-01	341.000
1935-04-01	350.000
1935-05-01	333.000
1935-06-01	338.000
1935-07-01	353.000
1935-08-01	323.000
1935-09-01	365.000
1935-10-01	345.000
1935-11-01	330.000
1935-12-01	345.000
1936-01-01	358.000
1936-02-01	349.000
1936-03-01	362.000
1936-04-01	344.000
1936-05-01	338.000
1936-06-01	363.000
1936-07-01	346.000
1936-08-01	361.000
1936-09-01	341.000
1936-10-01	345.000
1936-11-01	357.000
1936-12-01	328.000
1937-01-01	354.000
1937-02-01	325.000
1937-03-01	360.000
1937-04-01	341.000
1937-05-01	339.000
1937-06-01	357.000
1937-07-01	339.000
1937-08-01	356.000
1937-09-01	333.000
1937-10-01	339.000
1937-11-01	348.000
1937-12-01	326.000
1938-01-01	359.000
1938-02-01	315.000
1938-03-01	333.000
1938-04-01	314.000
1938-05-01	332.000
1938-06-01	309.000
1938-07-01	321.000
1938-08-01	341.000
1938-09-01	321.000
1938-10-01	354.000
1938-11-01	329.000
1938-12-01	323.000
1939-01-01	352.000
1939-02-01	318.000
1939-03-01	332.000
1939-04-01	330.000
1939-05-01	344.000
1939-06-01	323.000
1939-07-01	348.000
1939-08-01	325.000
1939-09-01	330.000
1939-10-01	357.000
1939-11-01	329.000
1939-12-01	325.000
1940-01-01	359.000
1940-02-01	326.000
1940-03-01	333.000
1940-04-01	342.000
1940-05-01	323.000
1940-06-01	325.000
1940-07-01	338.000
1940-08-01	314.000
1940-09-01	340.000
1940-10-01	334.000
1940-11-01	329.000
1940-12-01	334.000
1941-01-01	340.000
1941-02-01	320.000
1941-03-01	353.000
1941-04-01	330.000
1941-05-01	329.000
1941-06-01	347.000
1941-07-01	339.000
1941-08-01	329.000
1941-09-01	360.000
1941-10-01	346.000
1941-11-01	343.000
1941-12-01	352.000
1942-01-01	389.000
1942-02-01	363.000
1942-03-01	390.000
1942-04-01	371.000
1942-05-01	387.000
1942-06-01	409.000
1942-07-01	411.000
1942-08-01	432.000
1942-09-01	396.000
1942-10-01	410.000
1942-11-01	401.000
1942-12-01	402.000
1943-01-01	443.000
1943-02-01	407.000
1943-03-01	443.000
1943-04-01	403.000
1943-05-01	433.000
1943-06-01	462.000
1943-07-01	471.000
1943-08-01	474.000
1943-09-01	423.000
1943-10-01	438.000
1943-11-01	443.000
1943-12-01	421.000
1944-01-01	444.000
1944-02-01	415.000
1944-03-01	436.000
1944-04-01	426.000
1944-05-01	454.000
1944-06-01	441.000
1944-07-01	496.000
1944-08-01	462.000
1944-09-01	441.000
1944-10-01	455.000
1944-11-01	438.000
1944-12-01	437.000
1945-01-01	468.000
1945-02-01	428.000
1945-03-01	453.000
1945-04-01	451.000
1945-05-01	451.000
1945-06-01	462.000
1945-07-01	497.000
1945-08-01	441.000
1945-09-01	422.000
1945-10-01	462.000
1945-11-01	435.000
1945-12-01	448.000
1946-01-01	476.000
1946-02-01	450.000
1946-03-01	489.000
1946-04-01	506.000
1946-05-01	451.000
1946-06-01	475.000
1946-07-01	521.000
1946-08-01	482.000
1946-09-01	505.000
1946-10-01	513.000
1946-11-01	491.000
1946-12-01	498.000
1947-01-01	513.000
1947-02-01	486.000
1947-03-01	536.000
1947-04-01	499.000
1947-05-01	488.000
1947-06-01	520.000
1947-07-01	506.000
1947-08-01	472.000
1947-09-01	528.000
1947-10-01	508.000
1947-11-01	467.000
1947-12-01	487.000
1948-01-01	528.000
1948-02-01	478.000
1948-03-01	519.000
1948-04-01	473.000
1948-05-01	473.000
1948-06-01	492.000
1948-07-01	462.000
1948-08-01	492.000
1948-09-01	474.000
1948-10-01	483.000
1948-11-01	499.000
1948-12-01	482.000
1949-01-01	513.000
1949-02-01	465.000
1949-03-01	486.000
1949-04-01	455.000
1949-05-01	463.000
1949-06-01	429.000
1949-07-01	423.000
1949-08-01	448.000
1949-09-01	435.000
1949-10-01	467.000
1949-11-01	422.000
1949-12-01	452.000
1950-01-01	451.000
1950-02-01	401.000
1950-03-01	433.000
1950-04-01	412.000
1950-05-01	432.000
1950-06-01	392.000
1950-07-01	405.000
1950-08-01	397.000
1950-09-01	401.000
1950-10-01	445.000
1950-11-01	410.000
1950-12-01	408.000
1951-01-01	446.000
1951-02-01	392.000
1951-03-01	412.000
1951-04-01	425.000
1951-05-01	400.000
1951-06-01	385.000
1951-07-01	404.000
1951-08-01	385.000
1951-09-01	387.000
1951-10-01	439.000
1951-11-01	395.000
1951-12-01	400.000
1952-01-01	423.000
1952-02-01	396.000
1952-03-01	427.000
1952-04-01	401.000
1952-05-01	388.000
1952-06-01	389.000
1952-07-01	373.000
1952-08-01	361.000
1952-09-01	412.000
1952-10-01	403.000
1952-11-01	380.000
1952-12-01	402.000
1953-01-01	413.000
1953-02-01	386.000
1953-03-01	421.000
1953-04-01	393.000
1953-05-01	389.000
1953-06-01	426.000
1953-07-01	362.000
1953-08-01	386.000
1953-09-01	383.000
1953-10-01	403.000
1953-11-01	410.000
1953-12-01	385.000
1954-01-01	405.000
1954-02-01	382.000
1954-03-01	432.000
1954-04-01	389.000
1954-05-01	383.000
1954-06-01	400.000
1954-07-01	365.000
1954-08-01	396.000
1954-09-01	385.000
1954-10-01	395.000
1954-11-01	418.000
1954-12-01	389.000
1955-01-01	427.000
1955-02-01	384.000
1955-03-01	411.000
1955-04-01	392.000
1955-05-01	412.000
1955-06-01	375.000
1955-07-01	361.000
1955-08-01	404.000
1955-09-01	391.000
1955-10-01	425.000
1955-11-01	399.000
1955-12-01	394.000
1956-01-01	431.000
1956-02-01	392.000
1956-03-01	406.000
1956-04-01	421.000
1956-05-01	399.000
1956-06-01	383.000