11. It's expected to be followed by a mass of polar air within four days. 12. GE is also a partner in Polar Air Cargo, which has 12 Boeing 747s. 13. Cold polar air from the south can bring cooler temperatures. 14. In the winter the arrival of polar air masses that drop and cause frost. 15. Another push of polar air will reach Texas on gusty winds from the north. 16. Advancing polar air will reach the Dakotas later Monday, preceded by clouds and flurries. 17. Two other American cargo carriers, Polar Air Cargo and UPS, would also gain such rights. 18. Polar air will be confined to the northern Plains on the final day of 2004.19. A surge of polar air into the Plains will keep temperatures far below seasonal levels. 20. Polar air will surge southward into the Middle Atlantic region and through the Ohio Valley.
