Anytime I have guested someone into the CH it has been through V-Flyer.
The first time was in the days when one didn't have to travel on the same flight. A V-Flyer was due to fly on the same day as I was and we were due to meet in the CH. At the last minute he had to change his plans and fly out a day earlier and asked if I would guest in his co-worker. I agreed and guested him in for his flight to IAD even though I was going to SFO. He tried to track me down to thank me but I was having a treatment at the time and so never met him.
The second time was when I discovered that a V-flyer was on my flight to SFO and he was only too delighted to be guested in - and a nicer young man you couldn't wish to meet.
The nearest I ever came to inviting a "Stray" so to speak was in NRT. She was an elderly lady flying in PE and I in UC. There had been severe snow storms in the UK . BA had cancelled a flight and the ensuing chaos (plus the fact that I blagged a through connection to Cork) meant that we had become separated but it is to my eternal regret that I did not bring her with me to the UC check -in and hence to the CH
