Planespotters, the World’s Most Obsessive Aviation Geeks

That said, here's my breakdown of their pictures:

1. Looks like a pair of Canon 7Ds with 70-300mm F4-5.6. The strap on the right suggests this. Even if we take the possibility of strap trolling into account, the labeling gives them away as Canon. The labeling also suggest that they aren't Rebel-series, given the all-white text. The side-ports also appear to be too large to be from Canon's full frame lines- although this is somewhat ambiguous. However, the pop-up flash button on the pentaprism hump firmly places these cameras as crop-sensor. The lenses match the Canon 70-300 non-L series. Sub-model distinction solely through cosmetics is difficult.

2. In the second picture the body is obscured by the owner's hand. However, the paint job of the lens clearly marks it as a Canon L-series telephoto. Judging from the size and twin focus/zoom rings, this lens is likely a Canon 70-200 F2.8. Sub-model distinction is again difficult at this resolution.

3. This camera is difficult, although clearly a Nikon. The label placement and lack of sync ports suggest a crop sensor model, but the left-side dial contradicts this. The high label disqualifies most options. The only seemingly plausible option is the rather old D200 (from 2005). The lens is also difficult, as the gold ring and dual control rings suggest a typical telephoto (70-200), but the lack of internal zooming contraindicates this. It could be an 80-400, but the size is a bit off. Hard to say.