![Boarding airplanes: Northwestern researcher models the inefficiency of back to front airplane boarding. Boarding airplanes: Northwestern researcher models the inefficiency of back to front airplane boarding.](http://www.slate.com/content/dam/slate/blogs/moneybox/2014/11/06/boarding_airplanes_northwestern_researcher_models_the_inefficiency_of_back/57024556-germany-files-picture-taken-14-july-2005-at-berlins.jpg.CROP.promo-mediumlarge.jpg)
Boarding airplanes: Northwestern researcher models the inefficiency of back to front airplane boarding.
![Check-in from 48 hours before your flight and up to 30 minutes before your scheduled departure time. Check-in periods may vary by location. Check-in from 48 hours before your flight and up to 30 minutes before your scheduled departure time. Check-in periods may vary by location.](https://en.aegeanair.com/-/media/images/heroimages/check_in_times.jpg?h=830&w=1920&la=en&hash=06EA348A6065DB384BF081B89D67842C)
Check-in from 48 hours before your flight and up to 30 minutes before your scheduled departure time. Check-in periods may vary by location.
![Travelers Boarding into Boeing 737 by Air Berlin on Madeira Airport. Time Lapse Stock Video - Video of boarding, flight: 213814573 Travelers Boarding into Boeing 737 by Air Berlin on Madeira Airport. Time Lapse Stock Video - Video of boarding, flight: 213814573](https://thumbs.dreamstime.com/x/timelapse-travelers-boarding-boeing-operated-air-berlin-madeira-portugal-timelapse-travelers-boarding-boeing-213814388.jpg)
Travelers Boarding into Boeing 737 by Air Berlin on Madeira Airport. Time Lapse Stock Video - Video of boarding, flight: 213814573
Airline Boarding Pass Tickets To San Francisco The Contents Of The Image Are Totally Invented And Does Not Contain Under Copyright Parts Stock Photo - Download Image Now - iStock
![Airline Boarding Pass Tickets To Rome Isolated On White - The Contents Of The Image Are Totally Invented Stock Photo, Picture And Royalty Free Image. Image 92598263. Airline Boarding Pass Tickets To Rome Isolated On White - The Contents Of The Image Are Totally Invented Stock Photo, Picture And Royalty Free Image. Image 92598263.](https://previews.123rf.com/images/france68/france681801/france68180100037/92598263-boletos-de-la-tarjeta-de-embarque-a-roma-aislados-en-blanco-el-contenido-de-la-imagen-est%C3%A1-totalment.jpg)
Airline Boarding Pass Tickets To Rome Isolated On White - The Contents Of The Image Are Totally Invented Stock Photo, Picture And Royalty Free Image. Image 92598263.
![Airline boarding pass tickets to Berlin isolated on white - The contents of the image are totally invented. The writings are not subject to copyright Stock Photo - Alamy Airline boarding pass tickets to Berlin isolated on white - The contents of the image are totally invented. The writings are not subject to copyright Stock Photo - Alamy](https://c8.alamy.com/comp/T8J88B/airline-boarding-pass-tickets-to-berlin-isolated-on-white-the-contents-of-the-image-are-totally-invented-the-writings-are-not-subject-to-copyright-T8J88B.jpg)
Airline boarding pass tickets to Berlin isolated on white - The contents of the image are totally invented. The writings are not subject to copyright Stock Photo - Alamy
![Einen Tag auf dem Jump bei Air Berlin (B738 nach PMI & XRY) - Flug- und Reiseberichte - ILS Flightforum Einen Tag auf dem Jump bei Air Berlin (B738 nach PMI & XRY) - Flug- und Reiseberichte - ILS Flightforum](http://frank.dkucher.de/fotos/LEJR/lerj-03.jpg)
Einen Tag auf dem Jump bei Air Berlin (B738 nach PMI & XRY) - Flug- und Reiseberichte - ILS Flightforum
![Airline Boarding Pass Ticket To Amsterdam Isolated On White Stock Photo, Picture And Royalty Free Image. Image 36084155. Airline Boarding Pass Ticket To Amsterdam Isolated On White Stock Photo, Picture And Royalty Free Image. Image 36084155.](https://previews.123rf.com/images/france68/france681501/france68150100079/36084155-billet-d-avion-carte-d-embarquement-%C3%A0-amsterdam-isol%C3%A9-sur-blanc.jpg)