PROVIDENCE – The ongoing decline in passenger traffic this year at T.F. Green Airport worsened in May, while cargo shipments continued to drop by double digits, according to figures released by the R.I. Airport Corporation.

In its monthly traffic report, the agency said 392,750 passengers passed through T.F. Green in May, down 8.5 percent from the same month last year, when the airport saw 429,003 passengers.

The year-over-year rate of decline in passenger traffic in May was more than double the rate posted in April, when traffic fell 4.1 percent compared with a year earlier.

In a change from the pattern in previous years, when traffic climbed as summer drew closer, T.F. Green did not see as many passengers in May as it did in April, with 2,749 fewer travelers passing through.

The number of passengers boarding planes at T.F. Green in May fell 9.3 percent to 191,596, down from 211,244 a year earlier, the agency said.

Southwest Airlines continued to be by far the largest carrier by passenger volume in May, with 211,741 local passengers, or 53.9 percent of the total number of passengers last month. Southwest’s passenger volume at T.F. Green was down 8.8 percent compared with a year ago.

T.F. Green’s second-largest carrier by passenger volume, U.S. Airways, carried 80,297 passengers, or 20.4 percent of the total number last month. That was basically unchanged from a year ago, when U.S. Airways had 80,384 passengers at T.F. Green.

Total cargo shipments through T.F. Green continued to trend far lower than last year, dropping to 1.7 million pounds in May, down 32.7 percent from a year earlier.

Freight shipments, which made up three-fourths of T.F. Green’s total cargo traffic, fell 35.3 percent – less than the 41.2 percent drop posted in April – to 1.28 million pounds.

Mail shipments, on the other hand, fell by more in May than they did in April, dropping 23.3 percent to 419,050 pounds. Mail shipments had fallen 20.3 percent the prior month.