We report observation of hexatic order in Abrikosov flux lattices in very clean crystals of the highTcsuperconductor Bi2.1Sr1.9Ca0.9Cu2O8+&dgr;(BSCCO). Our experiments consist ofin situmagnetic decoration of the flux lattice at 4.2 K. Analysis of the decoration images shows that the positional order decays exponentially with a correlation length of a few lattice constants while the orientational order persists for hundreds of lattice constants and decays algebraically with an exponent &eegr;6=0.06±0.01. Our results confirm recent theoretical speculation that the positional order should be far more sensitive to disorder than the orientational order and that the low temperature ordered phase of the flux lines in these systems might be an hexatic glass.