Insightful. United's 7xxx are now Express flights. Another curious question, though I have no direct evidence of it myself. = Are there any flight numbers that due to linguistic reasons are not = used? For example manufacturers of products with serial numbers with = either use 1's or I's, but never both (same goes with O's and 0's.) Matthew -----Original Message----- From: The Airline List [mailto:AIRLINE@LISTSERV.CUNY.EDU] On Behalf Of = Michael C. Berch Sent: January 25, 2002 12:31 PM To: AIRLINE@LISTSERV.CUNY.EDU Subject: United's flight number scheme (was Re: AC's 3xxx flight #s) As of a year or two ago, United's scheme was approximately this: UA1-UA2 Round-the-world flights (gone = now?) UA3-UA799 General domestic and = Canada flights UA800-899 Pacific flights (incl. = US continuation segments) UA900-999 Atlantic flights (incl. = US continuation segments) UA1000-1999 General domestic and Canada = flights UA2000-2999 Shuttle by United (gone now) UA3000-3999 Code shares on other carriers UA4000-6999 United Express (operated by = contractors) UA7000-7999 Unused? Charters? Cargo? UA8000-8999 Reserved for ATC renumbering* UA9000-9999 Special flights - charters, = extra "passenger protection" sections, delivery and = repositioning flights, etc. Normally even numbers are eastbound, odd are westbound. * When flights with a similar or the same number would overlap in an ATC = sector, one of the flights is renumbered, usually flight number + 8000. For example, let's say UA921 operates LHR-ORD-LAX (with a change of equipment in ORD). If the inbound from London is seriously delayed, = UA may dispatch the domestic continuation (most of whose pax have no = idea "their" flight is delayed inbound, since there's an empty 767 = sitting there at the gate), and the inbound LHR-LAX pax will be accommodated on other flights. The domestic leg will be redesignated UA8921 for ATC purposes so it does not get confused with the "real" = UA921 coming in from LHR. These schemes have been upset by the termination of Shuttle by United; = it would be nice to know UA's current scheme, although I'm sure it is = somewhat similar. -- Michael C. Berch mcb@postmodern.com