Per Part 63.100 of the Federal Communication Commission's Rules and Regulations, carriers are required to report any outage which potentially affects a major airport. Such an outage is defined as an outage that disrupts 50% or more of the air traffic control links or other FAA communications links to any major airport, any outage that has caused an Air Route Traffic Control Center (ARTCC) or major airport to lose its radar, any ARTCC or major airport outage that has received any media attention of which the carrier's reporting personnel are aware, any outage that causes a loss of both primary and backup facilities at any ARTCC or major airport, and any outage to an ARTCC or major airport that is deemed important by the FAA as indicated by FAA inquiry to the carrier management personnel. For purposes of reporting such outages, "major airports" are defined as those airports described by the FAA as large or medium hubs. The most current list of these "major airports" (for calendar year 1999) is as follows: (69 total)

1. ATL - The William B. Hartsfie (Atlanta, GA)

2. ORD - Chicago O'Hare Int'l (Chicago, IL)

3. LAX - Los Angeles Int'l (Los Angeles, CA)

4. DFW - Dallas/Fort Worth Int'l (Dallas-Fort Worth, TX)

5. SFO - San Francisco Int'l (San Francisco, CA)

6. DEN - Denver Int'l (Denver, CO)

7. DTW - Detroit Metropolitan (Detroit, MI)

8. EWR - Newark Int'l (Newark, NJ)

9. PHX - Phoenix Sky Harbor (Phoenix, AZ)

10. MIA - Miami Int'l (Miami, FL)

11. LAS - McCarran Int'l (Las Vegas, NV)

12. MSP - Minneapolis-St. Paul Int'l (Minneapolis-St. Paul, MN)

13. JFK - John F. Kennedy Int'l (New York, NY)

14. IAH - George Bush Int'l (Houston, TX)

15. STL - Lambert-St. Louis Int'l (St. Louis, MO)

16. MCO - Orlando Int'l (Oralndo, FL)

17. SEA - Seattle-Tacoma Int'l (Seattle, WA)

18. BOS - General Edward Lawrence (Boston, MA)

19. LGA - LaGuardia (New York, NY)

20. PHL - Philadelphia Int'l (Philadelphia, PA)

21. HNL - Honolulu Int'l (Honolulu. HI)

22. CVG - Cincinnati/Nort (Covington-Cincinati, OH)

23. CLT - Charloote/Douglas Int'l (Charlotte, NC)

24. SLC - Salt Lake City (Salt Lake City, UT)

25. IAD - Washington Dulles Int'l (Chantilly, VA)

26. PIT - Pittsburgh Int'l (Pittsburgh, PA)

27. BWI - Baltimore-Washington INt'l (Baltimore, MD)

28. SAN - San Diego Int'l (San Diego, CA)

29. TPA - Tampa Int'l (Tampa, FL)

30. DCA - Ronald Reagan National (Arlington, VA)

31. FLL - Fort Lauderdale/Holl (Fort Lauderdale, FL)

32. PDX - Portland Int'l (Portland, OR)

33. MDW - Chicago Midway (Chicago, IL)

34. CLE - Cleveland Hopkins Int'l (Cleveland, OH)

35. MCI - Kansas City Int'l (Kansas City, MO)

36. SJC - San Jose Int'l (San Jose, CA)

37. MEM - Memphis Int'l (Memphis, TN)

38. OAK - Metropolitan Oakland Int'l (Oakland, CA)

39. SJU - Luis Munoz Marin Int'l (San Jose, Puerto Rico)

40. MSY - New Orleans Int'l (New Orleans, LA)

41. RDU - Raleigh Durham Int'l (Raleigh, NC)

42. HOU - William P. Hobby (Houston, TX)

43. BNA - Nashville Int'l (Nashville, TN)

44. SMF - Sacremento Int'l (Sacremento, CA)

45. SNA - John Wayne Airport- Oran (Santa Ana, CA)

46. IND - Indianapolis Int'l (Indianapolis, IN)

47. DAL - Dallas Love Field (Dallas, TX)

48. SAT - San Antonio Int'l (San Antonio, TX)

49. CMH - Port Columbus Int'l (Columbus, OH)

50. AUS - Austin-Bergstrom Int'l (Austin, TX)

51. BDL - Bradley Int'l (Windsor Locks, CT)

52. ABQ - Albuquerque Int'l Sunpo (Albuquerque, NM)

53. ONT - Ontario Int'l (Ontario, CA)

54. MKE - General Mitchell Int'l (MIlwaukee, WI)

55. RNO - Reno/Tahoe Int'l (Reno, NV)

56. OGG - Kahalui (Kahalui, HI)

57. PNI - Palm Beach Int'l (West Palm Beach, FL)

58. PVD - Theodore Francis Green (Providence, RI)

59. ANC - Anchorage Int'l (Anchorage, AK)

60. JAX - Jacksonville Int'l (Jacksonville, FL)

61. RSW - Southwest Florida Int'l (Fort Meyers, FL)

62. BUR - Burbank-Glendale-Pasadena (Burbank, CA)

63. SDF - Louisville Int'l-Stani (Louisville, KY)

64. OMA - Eppley Airfield (Omaha, NB)

65. BUF - Buffalo-Niagra Int'l (Buffalo, NY)

66. TUS - Tucson Int'l (Tucson, AZ)

67. OKC - Will Rogers World (Oklahoma City, OK)

68. TUL - Tulsa Int'l (Tulsa, OK)

69. ELP - El Paso Int'l (El Paso, TX)