'Puffer' Machines Coming

Dulles International and Reagan National airports will be among 10 U.S. airports this summer to receive "puffer" machines for detecting explosives residue. Passengers chosen for secondary screenings will walk through the device and stand still for a few seconds as air is puffed on them and then chemically analyzed. The Transportation Security Administration is paying $6.8 million for 44 of the devices, which it has been testing in 14 airports since last year. Baltimore-Washington International Airport has been using the machine since February.

United Offers Extra Miles

United and United Express passengers on some flights that arrive more than 30 minutes late at National and several other airports will receive 500 extra air miles. The flights include all nonstop United and United Express flights between National and Chicago O'Hare, as well as flights between O'Hare and the following cities or airports: Boston, Dallas/Ft. Worth, Minneapolis, Newark, LaGuardia and Philadelphia. Passengers must be United Mileage Plus members and register at www.united.com/business1.

Flight Changes

* United Express will end flights between Dulles and Wilkes-Barre/Scranton International Airport in Pennsylvania on Aug. 3. The round-trip flights had operated three times daily since October.

-- Compiled by LILA DE TANTILLO