Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Airline | Destination(s) | Aircraft Scheduled | Service Date(s) | Comments |
| --- | --- | --- | --- | --- |
| Air Florida | New York JFK, Tampa, Washington National | Boeing 737-200, DC-9-10 | JFK: 6/14/79-9/5/79, DCA: 10/26/79-9/30/1982, TPA: 02/1980-9/30/1982 |  |
| AirTran Airways | Atlanta, Dayton, Orlando | Boeing 737-200, DC-9-30, Boeing 717-200 | 11/14/1996-2/28/1998, 10/3/2000-4/29/2002 |  |
| Air Wisconsin | Akron-Canton, Chicago O'Hare, Cleveland, Columbus, Flint, Fort Wayne, Kalamazoo, Pittsburgh, South Bend | BAe 146, BAe ATP, Dash 8-300, Dash 7, Metro III | ?-02/03/1993 | Original and operating as United Express. |
| Allegiant Air* | Las Vegas | MD-80 | 12/15/2005-4/24/2006 |  |
| America West Express | Columbus, Flint | Beech 1900 |  | Operated by Mesa dba Superior Airlines |
| American Eagle Airlines* | Dallas/Fort Worth | ERJ-145 |  | Operated by Simmons Airlines (now American Eagle Airlines) and Chautauqua Airlines (dba AmericanConnection until name change to American Eagle) |
| Atlantic Coast Airlines | Cincinnati | Dornier 328JET |  | dba Delta Connection |
| Atlantic Southeast Airlines | Atlanta, Cincinnati | ATR 72, CRJ-200, CRJ-700 |  | dba Delta Connection |
| Beaver Aviation / BAS Airlines | Beaver Falls (PA), Detroit City, Youngstown | Piper Navajo | Early 1980s |  |
| Capital Airlines | Akron, Chicago, Cleveland, Detroit, Flint, Grand Rapids, Lansing, Muskegon, Pittsburgh, Philadelphia | Viscount, DC-3, DC-4 | 1/8/1948-05-31-1961 | * Merged with United. * At the time, 14 flights at startup was the most ever for a new city. |
| Chicago Express Airlines | Chicago Midway, South Bend | Jetstream 31, Saab 340 | 1993-1995, 6/28/2002-1/4/2005 | Original and returned as ATA Connection |
| Chicago and Southern Airlines | Deroit, Fort Wayne |  |  | Merged with Delta |
| Comair | Atlanta, Cincinnati, Columbus, Indianapolis | Piper Chieftain, Piper Navajo, EMB-110, Saab 340, EMB-120, Metro III, CRJ-100, CRJ-200, CRJ-700 | 1979, 01/03/1981-? | Original and as Delta Connection |
| Continental Express | Cleveland | EMB-120, Beech 1900, Dash-8-200 |  |  |
| Delta Air Lines | Atlanta, Cincinnati, Dayton, Detroit, Fort Wayne | Convair 440, Boeing 727-200, Boeing 737-300, MD-88, DC-9-30 |  |  |
| Eastern Airlines | Columbus | Constellation L-1049G, Locheed Electra, Boeing 727-100, Boeing 727-200, DC-9-30, DC-9-50 |  |  |
| Frontier Airlines mk 1 | Denver, Detroit | Boeing 737-200, MD-80 |  |  |
| Liberty Airlines | Chicago Midway & O'Hare | Convair 440 | 02/1982-5/16/1983 | Plans for CMH, CLE, STL, BUF, & EWR scrapped. Also flew CAK-ORD |
| Midway Connection | Chicago Midway | EMB-120, Dornier 228 |  |  |
| Mesaba Aviation | Detroit, Youngstown | Dash 8-200, Fokker 27, Metro III, Saab 340 |  | Original and dba Northwest Airlink |
| Piedmont Airlines | Dayton | Boeing 727-200, Boeing 737-200 |  | Merged with USAir |
| TransMeridian Airlines | Las Vegas, Sanford/Orlando | Boeing 757-200, Boeing 727-200, MD-80 |  | Filed for Bankruptcy |
| Trans Midwest Airlines | Columbus, Dayton, Detroit Metro, Lima | Piper Navajo | 1983-1985 |  |
| Trans World Airlines | St. Louis | Boeing 727-100, DC-9, Martin 404 |  |  |
| United Airlines | Chicago O'Hare, Cleveland, Denver, Fort Wayne, Peoria, Saginaw | DC-8 series 21, Boeing 727-122, 727-222, Boeing 737-222,Caravelle, Boeing 720, Convair 340, DC-6B |  |  |
| US Airways (USAir/Allegheny) | Pittsburgh | Convair 580, Boeing 727-200, MD-80, Boeing 737-200/300/400, DC-9-30, BAe 1-11, Fokker 100, Fokker 28 |  |  |
| US Airways Express | Dayton, Indianapolis, Pittsburgh | Metro III, Jetstream 31, Saab 340, Dash 8-100/200, ERJ 145, Dornier 328 |  | Operated by Trans States Airlines, Jetstream Int'l / PSA Airlines, Allegheny Airlines, Chautauqua Airlines, Shuttle America |
| Vision Airlines | Myrtle Beach | Boeing 737-400 | 6/1 - 6/29/2012 |  |
Question:
how many airlines have at least three service dates?
Answer:
1