There is a baggage drop-off counter as you exit Customs. The TA in GUA may generally issue your boarding passes.
Pleae read the post directly above, as it is possible MIA has changed in terms of timeliness in the last couple of months (I hope so!) ^
Originally Posted by Reteli
Does that mean I cannot even get the boarding passes for MIA-LHR in GUA? Or do I only need to look for a special baggage drop-off counter to re-check the suitcases?