What are you sending and where to?

I was specifically referring to bulkier casino related items to the UK as I thought that was what Robert was interested in.

I receive many such boxes each week. I guarantee you that any 'box' mailed here that is not priority, express or better will take a minimum of 4 weeks and often shows up labelled "carried at sea". No way that is what I regard as 'airmail'.
Plain 'letters', I accept, are treated the same regardless of the service paid for. Same seems to apply from UK to US.

Other than overnight, there is no service that will get anything here faster than 5 days. Even overnight takes 3 days unless you use Fedex (and then it is still 2 days). Priority, express and global guaranteed all take the same time to get here. Have tried them all many times. Flat rate priority is the best way to go.