I'm seeing about 25,600 S/X deliveries for Q3. According to this latest Electrek article, after 2 months of Q3 production,
"Tesla produced about 53,000 vehicles including over 34,700 Model 3 vehicles in Q3 as of Friday (Aug 31)."
In the last week of production,
"the automaker built about 6,400 vehicles during the last week (last 7 days) of August (from 24th to 31st midday) including about 4,300 Model 3 vehicles."
Tesla misses Model 3 production goal of 6,000 units per week, but on track for overall Q3 goal
53,000 - 34,700 = 18,300 S/X so far. That's a weekly production rate of 2,033 if we assume 9 weeks of production thus far. If we subtract 1/2 week of production due to the July 4th holiday week, that yields a weekly production rate of 2,150. With the Labor Day holiday, we have about 3 1/2 weeks of production left to go in the quarter. Let's assume 2,100 production per week going forward, which was the production rate for the last week in August. That amounts to 7,300 for the rest of September. Adding this to 18,300 gives a total production of 25,600 for the quarter.
What about the in transit vehicles from Q2? There were 3,892 S/X in transit from Q2, so we can add those to the deliveries but we also have to subtract the in transit vehicles at the end of Q3. What will that number be? The in transit number from Q3 2017 was 4,820. There were 3,500 in transit at the end of Q2 2017. We have to just guess at a reasonable in transit number that will ultimately prove wrong, but let's assume 3,892 S/X in transit at the end of this quarter. That's quite a bit lower than Q3 2017, but it seems plausible and makes the math simple. That would offset the in transit from Q2. This means total S/X deliveries should be around 25,600. I think that's a very reasonable estimate, with the actual number probably falling somewhere between 25,000 - 26,000. LUV is assuming 27,000, so that is really close but may prove to be slightly optimistic. If it ends up being 26,000 rather than 27, that reduces revenue by about $100M.