We nearly got stranded in Athens, Greece -- due to a 3-day pilot's strike. Our return flights were scheduled for April 2, the first day of the strike.
However, a quick trip to the Athens Airport on the Metro (a 28 Euro expense) and a very helpful Lufthansa "Star Alliance" ticketing rep, got us out on time.
Instead of going thru Munich, we ended up taking Aegean to London/Heathrow, and then another connecting flight on United from London to Chicago.
NONE of the planes we were on had a single empty seat. We were very lucky to have not been stranded, as the telephone agents for Lufthansa told us we could not get out until April 7th or April 8th.
We even lined up a hotel room at Centrotel for only 37 Euros per night, and they held the room for no charge, and then we cancelled the reservation after we were able to determine that we could get out on our original return date.
They showed us the room, it was very luxurious for such a sketchy neighborhood. However, it was way cheaper than extending our stay at Athens Gate Hotel. (the price we paid was 70 Euros per night between March 25 thru April 1, but their price to stay over would have been double-- hence our proposed switch to Centotel).
If you don't mind the out-of-the-way location-- we recommend the Centrotel for someone on a budget.
The Athens Gate Hotel is also highly recommended, but is rather expensive if you don't book on Hotwire at least 90 days in advance.