Your welcome, however your example doesn't address the problem. GLA and LGW are both in the UK, so of course this luggage can be checked through to the destination in the US. It is at the US end at which luggage is required to be cleared at the first point of entry. So for example, checked through luggage from GLA to LGW to JFK to CLT for example, the luggage would travel from Glasgow to JFK no problem. However, at JFK, they would have to collect their luggage, go through security and customs, put the luggage back into the system and then collect the bags again in CLT. However, the reverse journey would allow the luggage to go directly from Charlotte to Glasgow.
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