TWR ADB123 line-up
ADB123 lining up
ADB123 we need three minutes run up on the rwy...
TWR phones approach controller...
ADB123 in this case is an Antonov 124. I was surprised by this the first time I had one on the freq.
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TWR: XXX456 line-up
XXX456: lining up XXX456
XXX456: we have a small technical issue, should be solved in 2-3 minutes.
TWR phones APP
10 seconds later
XXX456, issue solved, we're good to go
These are only two scenarios. There are certainly many more but my guess is that there was already metal on the RWY