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Have Justin Bieber and Selena Gomez rekindled their flame ... again? It looks like the on-again-off-again couple may be back ON!

Many of their fans already know Justin has a track record for deleting every pic he posts to Instagram with Selena ... but something is different about the most recent photo he posted - he didn't delete it!!

The black and white photo is of the two of them next to each other, Justin staring into the camera and Selena looking in his direction. Biebs put no caption on the pic.

Some reports suggest the two went away together. J Biebs did post other pics the same day on a plane! Hmmm.

SO .... Jelena lives again?