Live Flight Tracking

I have been wondering about this for along time! Below are the Top 10 Airlines of the world who operate the most aircrafts. Which airline out of those 10 will be the first to reach 1000? Or is there another airline that could?

Rank Airline Fleet size Orders
1 Delta Air Lines 744 121
2 SkyWest 727 74
3 United Airlines 712 116
4 Lufthansa 710[1] 155
5 Southwest 700 142
6 American 611 410 [Some are undisclosed right?]
7Air France-KLM 616 80
8 IAL[2] 420 134
9 Air Canada[3] 362 37
10 CSA[4] 362 13

[1] Includes subsidiaries and cargo
[2] International Airline Group [British Airways and Iberia Airways
[3] Includes Air Canada Express
[4] China Southern Airlines

None of the above. Aeroflot, prior to the break up of the Soviet Union, operated over 1,000 aircraft.