Originally Posted by
aluminium persuader
But here's a chestnut - could you issue a clearance via txt?
Legally, I don't know or care, but I actually received a landing clearance SMS from an Italian TWR in 2002, as a friend of us made a relay with his cell-phone.
"CLR TO LAND RWY 33"
Hilarious and silent approach, and big fire engines in tow after landing. Normal procedure I guess !
In the case of a technical glitch, a radio failure say, any means is good to overcome the situation.