Your carrier-by-carrier guide New Year flight plans December 29, 1999 Web posted at: 4:49 p.m. EST (2149 GMT) ATLANTA (CNN) -- Some talk of financial reasons, others cite safety criteria. On whatever basis, many airlines' officials have decided to trim flight schedules or ground planes entirely around the 2000 changeover. Thin demand and sparse bookings are mostly to blame. But some airline spokespeople say their companies want to take precautions against the so-called Y2K computer bug. They say they're not worried about their own systems but outside glitches that could present problems. The International Civil Aviation Organization (ICAO) has recommended airline operations be suspended between 6:45 p.m. ET and 7:30 p.m. ET on December 31 and between 12:45 a.m. and 1:30 a.m. ET on January 1. Here's a rundown on which carriers plan to fly around New Year's Eve. Aerolineas Argentinas: Suspending operations 8:30 p.m. Buenos Aires time (6:30 p.m. ET, 11:30 p.m. GMT) December 31. Plans to resume the next morning. Air Zimbabwe: Scheduling only domestic flights between December 31 and January 1. Alaska Airlines: Canceling all 174 flights from 9 p.m. PT (12 a.m. ET, 5 a.m. GMT) New Year's Eve to 9 a.m. PT (noon ET, 5 p.m. GMT) New Year's Day. American Airlines: Canceling 20 percent of New Year's Eve flights. Planning to have 17 planes aloft at midnight, including one over the United States with Federal Aviation Administrator (FAA) Jane Garvey aboard. The others are expected to be on trans-Atlantic or trans-Pacific routes, landing during daylight hours. America West: Expecting to have one flight in the air -- 1841 from Phoenix, Arizona, to Fort Lauderdale, Florida -- at 12 a.m. ET (5 a.m. GMT) January 1, USA Today reports. British Airways: Plans to have 20 jets in the air at midnight GMT (7 p.m. ET). Spokespeople say none will be bound for the Indian subcontinent. Some international air-transport association officials have voiced concerns about Y2K readiness in India and Pakistan, although regional authorities say all is in order. Cathay Pacific Airways: Scratching 78 flights, or 18 percent of its schedule, between December 30 and January 3. Cintra (Mexico): Canceling two flights scheduled for December 31, and changing itineraries so most planes in the fleet reach their destinations late on Friday and resume operation early on Saturday. Continental: Cutting 25 percent or 344 flights on New Year's Eve. Also grounding 15 percent or 169 flights on New Year's Day. Expecting to have 16 planes flying as 12 a.m. January 1 is reached in each aircraft's respective time zone. Delta Air Lines: Scheduling 48 flights to be airborne as 12 a.m. January 1 is reached in each aircraft's respective time zone. The carrier has cut its flight schedule by 18 percent over New Year's Eve and Day. Iran Air: Canceling or delaying flights from December 31 to January 1, according to reports from the Islamic Republic News Agency. Japan Airlines: Canceling 21 flights around the time changeover. Planning to avoid takeoffs and landings for an hour before and after 12 a.m. January 1 Tokyo time (10 a.m. ET December 31, 3 p.m. GMT December 31) December 31. KLM: Grounding all but two planes the night of December 31. Expecting to resume schedule January 1 and operate a full schedule beginning January 2. Kuwait Airways: Planning to cancel all flights for a 16-hour period around the New Year. LOT Polish Airlines: Planning no flights. Malaysia Airlines: Canceling 92 international and domestic flights. Northwest Airlines: Canceling five flights (United States-The Netherlands, The Netherlands-India) on December 31. Planning to operate most trans-Atlantic flights as scheduled over the New Year's evening period. Qantas Airways: Planning to operate more than 430 international flights between December 29 and January 2, about 13 percent below normal traffic. The airline says it won't have any scheduled domestic flights in the air as midnight occurs in each of the the five Australian time zones. Qatar Airways: Planning no flights the evening of December 31, airline officials tell the Associated Press and the Agence France-Presse. Sabena: Conducting one test flight on New Year's Eve, with CEO Paul Reutlinger as sole passenger. Saudi Arabian Airlines: Suspending its flights "for a few minutes" at 12 a.m. January 1 (4 p.m. ET December 31, 9 p.m. GMT December 31), the Al-Iqtissadiya newspaper reports. Singapore Airlines: Scheduling flights to Australia and New Zealand. Scratching or rescheduling 60 others bound elsewhere. Southwest Airlines: Planning to cease operations from 10 p.m. December 31 to 8 a.m. on January 1, in each U.S. time zone. TAAG (Angola): Scheduling no flights. Thai Airways: Canceling 19 flights. United Airlines: Cutting flight schedule by approximately 34 percent on December 31 and 14 percent on January 1. US Airways: Planning to have eight domestic and international flights in the air during time changeover. Trimming close to a third of its usual 2,300 flights during the holiday weekend period. Virgin Atlantic Airways: Planning no flights. Owner Richard Branson has said the stand-down is scheduled to allow airline employees to enjoy the holiday. The Associated Press and Reuters contributed to this report.