Is this a 737-800 or 737 MAX 8?
2 Answers
From Wikipedia:
The MAX is re-engined with more efficient CFM International LEAP-1B powerplants, aerodynamic improvements (most notably split-tip winglets), and airframe modifications.
Checking what the new features are allow for easier identification. The photo you have lacks the split-tip wingtip device. And when the viewing angle is tricky, like the one below, the engine chevrons would be another thing to look for (only available on the MAX series).
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1$\begingroup$ One other way to tell an NG from a MAX by the engines: all Classic and NG 737s have the famous "hamster-pouch" intakes, while the 737 MAX series have bog-standard circular intakes. Also, 737NGs can also have split-tip winglets, although of a slightly different "split-scimitar" design. $\endgroup$– VikkiCommented May 24, 2018 at 13:48
The tail number in the photo looks to be A6-FEA, which is a 737-800. (The A6-F part is harder to make out, but it's used by flydubai's entire fleet.)
I would suggest using the highest resolution photo available and zooming in, as your aircraft ID questions all seem to have visible tail numbers, though some are hard to make out once they've been scaled by the Stack Exchange uploader.